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FILE - Russian President Vladimir Putin conducts training with the forces and means of the ground, sea and air components of the nuclear deterrent forces in Moscow, Russia, Oct. 25, 2023. Putin said that Moscow could revise its nuclear doctrine outlining conditions for atomic weapons use to take into account the evolving global situation. (Gavriil Grigorov, Sputnik, Kremlin Pool Photo via AP, File)

FILE - Russian President Vladimir Putin conducts training with the forces and means of the ground, sea and air components of the nuclear deterrent forces in Moscow, Russia, Oct. 25, 2023. Putin said that Moscow could revise its nuclear doctrine outlining conditions for atomic weapons use to take into account the evolving global situation. (Gavriil Grigorov, Sputnik, Kremlin Pool Photo via AP, File)

FILE - In this photo released by the Russian Defense Ministry Press Service, the Russian nuclear submarines Prince Vladimir, above, and Yekaterinburg are harbored at a naval base in Gazhiyevo, on the Kola Peninsula in Russia, on April 13, 2021. Russian hawks have called for revising the country's nuclear doctrine to lower the threshold for the use of nuclear weapons, and President Vladimir Putin said the doctrine could be modified. (Russian Defense Ministry Press Service via AP, File)

FILE - In this photo released by the Russian Defense Ministry Press Service, the Russian nuclear submarines Prince Vladimir, above, and Yekaterinburg are harbored at a naval base in Gazhiyevo, on the Kola Peninsula in Russia, on April 13, 2021. Russian hawks have called for revising the country's nuclear doctrine to lower the threshold for the use of nuclear weapons, and President Vladimir Putin said the doctrine could be modified. (Russian Defense Ministry Press Service via AP, File)

FILE - In this photo taken from video released by Russian Defense Ministry Press Service on Oct. 26, 2022, a Yars intercontinental ballistic missile is test-fired as part of Russia's nuclear drills from a launch site in Plesetsk, northwestern Russia. Russian President Vladimir Putin has monitored drills of the country's strategic nuclear forces involving multiple practice launches of ballistic and cruise missiles. The Kremlin said in a statement that all the test-fired missiles reached their designated targets. (Russian Defense Ministry Press Service via AP, File)

FILE - In this photo taken from video released by Russian Defense Ministry Press Service on Oct. 26, 2022, a Yars intercontinental ballistic missile is test-fired as part of Russia's nuclear drills from a launch site in Plesetsk, northwestern Russia. Russian President Vladimir Putin has monitored drills of the country's strategic nuclear forces involving multiple practice launches of ballistic and cruise missiles. The Kremlin said in a statement that all the test-fired missiles reached their designated targets. (Russian Defense Ministry Press Service via AP, File)

FILE - Soldiers stand next to a Russian RS-24 Yars ballistic missile parked along Tverskaya street prior to a rehearsal for the Victory Day military parade in Moscow, on May 2, 2024. Russia's nuclear doctrine says the country could use nuclear weapons in response to a nuclear strike or an attack with conventional weapons that threatens "the very existence" of the Russian state. (AP Photo/Alexander Zemlianichenko, File)

FILE - Soldiers stand next to a Russian RS-24 Yars ballistic missile parked along Tverskaya street prior to a rehearsal for the Victory Day military parade in Moscow, on May 2, 2024. Russia's nuclear doctrine says the country could use nuclear weapons in response to a nuclear strike or an attack with conventional weapons that threatens "the very existence" of the Russian state. (AP Photo/Alexander Zemlianichenko, File)

FILE - In this image released by the Russian Defense Ministry Press Service on May 21, 2024, a Russian Iskander missile is seen at an undisclosed location in Russia during drills for using tactical nuclear weapons. Russian hawks have called for revising the country's nuclear doctrine to lower the threshold for using nuclear weapons, and Russian President Vladimir Putin said the doctrine could be modified. (Russian Defense Ministry Press Service via AP, File)

FILE - In this image released by the Russian Defense Ministry Press Service on May 21, 2024, a Russian Iskander missile is seen at an undisclosed location in Russia during drills for using tactical nuclear weapons. Russian hawks have called for revising the country's nuclear doctrine to lower the threshold for using nuclear weapons, and Russian President Vladimir Putin said the doctrine could be modified. (Russian Defense Ministry Press Service via AP, File)

FILE - In this photo taken from video released by the Russian Defense Ministry on July 23, 2024, Russian soldiers install a camouflage on Yars intercontinental ballistic missile launcher during a military exercise in Yoshkar-Ola, the Republic of Mari El, Russia. Russia's nuclear doctrine says the country could use nuclear weapons in response to a nuclear strike or an attack with conventional weapons that threatens "the very existence" of the Russian state. (Russian Defense Ministry Press Service via AP, File)

FILE - In this photo taken from video released by the Russian Defense Ministry on July 23, 2024, Russian soldiers install a camouflage on Yars intercontinental ballistic missile launcher during a military exercise in Yoshkar-Ola, the Republic of Mari El, Russia. Russia's nuclear doctrine says the country could use nuclear weapons in response to a nuclear strike or an attack with conventional weapons that threatens "the very existence" of the Russian state. (Russian Defense Ministry Press Service via AP, File)

FILE - In this handout photo released by the Roscosmos Space Agency Press Service on April 20, 2022, the Sarmat intercontinental ballistic missile is launched from Plesetsk in northwestern Russia. Hawks in Russia have called for revising the country's nuclear doctrine to lower the threshold for using nuclear weapons, and President Vladimir Putin said the doctrine could be modified. (Roscosmos Space Agency Press Service via AP, File)

FILE - In this handout photo released by the Roscosmos Space Agency Press Service on April 20, 2022, the Sarmat intercontinental ballistic missile is launched from Plesetsk in northwestern Russia. Hawks in Russia have called for revising the country's nuclear doctrine to lower the threshold for using nuclear weapons, and President Vladimir Putin said the doctrine could be modified. (Roscosmos Space Agency Press Service via AP, File)

In this photo released by Russian Defense Ministry Press Service on Monday, July 22, 2024, a Yars intercontinental ballistic missile launcher rolls from an hangar during a military exercise near Yoshkar-Ola, Russia. Hawks in Russia have called for revising the country's nuclear doctrine to lower the threshold for using nuclear weapons, and President Vladimir Putin said the doctrine could be modified. (Russian Defense Ministry Press Service via AP)

In this photo released by Russian Defense Ministry Press Service on Monday, July 22, 2024, a Yars intercontinental ballistic missile launcher rolls from an hangar during a military exercise near Yoshkar-Ola, Russia. Hawks in Russia have called for revising the country's nuclear doctrine to lower the threshold for using nuclear weapons, and President Vladimir Putin said the doctrine could be modified. (Russian Defense Ministry Press Service via AP)

FILE - In this undated photo released on April 13, 2021, by the Russian Defense Ministry Press Service, a Tu-160 strategic bomber of the Russian air force is shown on a training mission somewhere in Russia. The country's nuclear doctrine details when its atomic weapons can be used – whether in response to a nuclear strike or an attack with conventional weapons that threatens "the very existence" of the Russian state. (Vadim Savitsky/Russian Defense Ministry Press Service via AP, File)

FILE - In this undated photo released on April 13, 2021, by the Russian Defense Ministry Press Service, a Tu-160 strategic bomber of the Russian air force is shown on a training mission somewhere in Russia. The country's nuclear doctrine details when its atomic weapons can be used – whether in response to a nuclear strike or an attack with conventional weapons that threatens "the very existence" of the Russian state. (Vadim Savitsky/Russian Defense Ministry Press Service via AP, File)

FILE - In this photo released by the Russian Defense Ministry Press Service on Feb. 2, 2024, Russian troops load an Iskander missile onto a mobile launcher during drills at an undisclosed location in Russia. Hawks in Russia have called for revising the country's nuclear doctrine to lower the threshold for using nuclear weapons, and President Vladimir Putin said the doctrine could be modified. (Russian Defense Ministry Press Service via AP, File)

FILE - In this photo released by the Russian Defense Ministry Press Service on Feb. 2, 2024, Russian troops load an Iskander missile onto a mobile launcher during drills at an undisclosed location in Russia. Hawks in Russia have called for revising the country's nuclear doctrine to lower the threshold for using nuclear weapons, and President Vladimir Putin said the doctrine could be modified. (Russian Defense Ministry Press Service via AP, File)

FILE - In this photo released by the Russian Defense Ministry Press Service on May 21, 2024, Russian air force crewmen at an undisclosed location in Russia prepare a Tu-22M3 bomber for a training mission as part of drills for using tactical nuclear weapons. Russia's nuclear doctrine says the country could use nuclear weapons in response to a nuclear strike or an attack with conventional weapons that threatens "the very existence" of the Russian state. (Russian Defense Ministry Press Service via AP, File)

FILE - In this photo released by the Russian Defense Ministry Press Service on May 21, 2024, Russian air force crewmen at an undisclosed location in Russia prepare a Tu-22M3 bomber for a training mission as part of drills for using tactical nuclear weapons. Russia's nuclear doctrine says the country could use nuclear weapons in response to a nuclear strike or an attack with conventional weapons that threatens "the very existence" of the Russian state. (Russian Defense Ministry Press Service via AP, File)

FILE - Russian President Vladimir Putin speaks at the Foreign Ministry in Moscow, Russia, June 14, 2024. Putin said Russia could revise its nuclear doctrine outlining conditions for when atomic weapons are used to take into account the evolving global situation. (AP Photo/Alexander Zemlianichenko, File)

FILE - Russian President Vladimir Putin speaks at the Foreign Ministry in Moscow, Russia, June 14, 2024. Putin said Russia could revise its nuclear doctrine outlining conditions for when atomic weapons are used to take into account the evolving global situation. (AP Photo/Alexander Zemlianichenko, File)

FILE - In this photo taken from video released by the Russian Defense Ministry Press Service on April 14, 2023, a Russian nuclear submarine sails to take part in the Pacific Fleet drills near Vladivostok, Russia. The country’s nuclear doctrine says Moscow could use nuclear weapons in response to a nuclear strike or an attack with conventional weapons that threatens "the very existence" of the Russian state. (Russian Defense Ministry Press Service via AP, File)

FILE - In this photo taken from video released by the Russian Defense Ministry Press Service on April 14, 2023, a Russian nuclear submarine sails to take part in the Pacific Fleet drills near Vladivostok, Russia. The country’s nuclear doctrine says Moscow could use nuclear weapons in response to a nuclear strike or an attack with conventional weapons that threatens "the very existence" of the Russian state. (Russian Defense Ministry Press Service via AP, File)

FILE - In this image from video provided by the Russian Defense Ministry Press Service, a Tu-95 strategic bomber from the Russian air force prepares to take off from an air base in Engels near the Volga River in Russia, on Jan. 24, 2022. Russia's nuclear doctrine says the country could use nuclear weapons in response to a nuclear strike or an attack with conventional weapons that threatens "the very existence" of the Russian state. (Russian Defense Ministry Press Service via AP, File)

FILE - In this image from video provided by the Russian Defense Ministry Press Service, a Tu-95 strategic bomber from the Russian air force prepares to take off from an air base in Engels near the Volga River in Russia, on Jan. 24, 2022. Russia's nuclear doctrine says the country could use nuclear weapons in response to a nuclear strike or an attack with conventional weapons that threatens "the very existence" of the Russian state. (Russian Defense Ministry Press Service via AP, File)