Young people participate in a concert marking the 10-year anniversary of Crimea's annexation by Russia on Red Square in Moscow, Russia, Monday, March 18, 2024. President Vladimir Putin seized Crimea from Ukraine a decade ago, a move that sent his popularity soaring but was widely denounced as illegal. (AP Photo/Alexander Zemlianichenko)
FILE - In this image taken from video released by the Russian Defense Ministry Press Service on Aug. 8, 2023, a Russian howitzer fires toward Ukrainian positions at an undisclosed location. Russian President Vladimir Putin has cast the conflict in Ukraine as a life-or-death battle against the West, with Moscow ready to protect its gains at any cost. (Russian Defense Ministry Press Service via AP, File)
FILE - Russian soldiers guard a pier where two Ukrainian naval vessels are moored, in Sevastopol, Ukraine, on Wednesday, March 5, 2014. When Ukraine's Kremlin-friendly president was ousted in 2014 by mass protests that Moscow called a U.S.-instigated coup, Russian President Vladimir Putin responded by sending troops to overrun Crimea and staging a plebiscite on joining Russia, which the West dismissed as illegal. (AP Photo, File)
FILE - Russian President Vladimir Putin, second right, Speaker of the Crimean legislature Vladimir Konstantinov, second left, Crimean Premier Sergei Aksyonov, left, and Sevastopol Mayor Alexei Chalyi, right, shake hands after signing a treaty for Crimea to join Russia in the Kremlin in Moscow, Tuesday, March 18, 2014. Russia's quick and bloodless seizure of Ukraine's Crimean Peninsula, home to Russia's Black Sea fleet and a popular vacation site, touched off a wave of patriotism and sent Putin's popularity soaring. "Crimea is ours!" became a popular slogan in Russia. (Yekaterina Shtukina, Sputnik, Pool Sputnik Government via AP, File)
Russian President Vladimir Putin is seen on the screens as he attends a concert marking his victory in a presidential election and the 10-year anniversary of Crimea's annexation by Russia on Red Square in Moscow, Russia, Monday, March 18, 2024. President Vladimir Putin seized Crimea from Ukraine a decade ago, a move that sent his popularity soaring but was widely denounced as illegal. (AP Photo/Alexander Zemlianichenko)
FILE - Men in unmarked uniforms stand guard during the seizure of the Ukrainian corvette Khmelnitsky in Sevastopol, Crimea, Thursday, March 20, 2014. When Ukraine's Kremlin-friendly president was ousted in 2014 by mass protests that Moscow called a U.S.-instigated coup, Russian President Vladimir Putin responded by sending troops to overrun Crimea and staging a plebiscite on joining Russia, which the West dismissed as illegal. (AP Photo, File)
FILE - Pro-Russian crowds celebrate in the central square in Sevastopol, Ukraine, on Monday, March 17, 2014. Russian flags fluttered above jubilant crowds after residents of Crimea voted overwhelmingly to secede from Ukraine and join Russia. When Ukraine's Kremlin-friendly president was ousted in 2014 by mass protests that Moscow called a U.S.-instigated coup, Russian President Vladimir Putin responded by sending troops to overrun Crimea and staging the plebiscite, which the West dismissed as illegal. (AP Photo, File)
FILE - Russian President Vladimir Putin, right, French President Emmanuel Macron, center, and Ukrainian President Volodymyr Zelenskyy take part at a meeting in the Elysee Palace in Paris, France, on Monday, Dec. 9, 2019. Russia viewed Zelenskyy's victory in Ukraine's 2019 presidential election as a chance to revive the anemic Minsk peace deal for eastern Ukraine, but Zelenskyy stood his ground, leaving the agreement stalled and Putin increasingly exasperated. (Christophe Petit Tesson/Pool via AP, File)
FILE - German Chancellor Angela Merkel, left, Russian President Vladimir Putin, right, and then Ukrainian president-elect Petro Poroshenko, center, talk at the 70th anniversary of D-Day in Benouville in Normandy, France, June 6, 2014. The Minsk agreement brokered by France and Germany, following painful defeats suffered by Ukrainian forces, obliged Kyiv to offer the separatist regions broad autonomy, including permission to form their own police force. (Regis Duvignau/Pool Photo via AP, File)
Russian President Vladimir Putin speaks at a concert marking his victory in a presidential election and the 10-year anniversary of Crimea's annexation by Russia on Red Square in Moscow, Russia, Monday, March 18, 2024. President Vladimir Putin seized Crimea from Ukraine a decade ago, a move that sent his popularity soaring but was widely denounced as illegal. (AP Photo/Alexander Zemlianichenko)
FILE - Pro-Russian gunmen take positions near the airport outside Donetsk, Ukraine, on Monday, May 26, 2014. Weeks after Russia annexed Ukraine's Crimea on March 18, 2014 , Moscow-backed separatists launched an uprising in eastern Ukraine, battling Kyiv's forces. The Kremlin denied supporting the rebellion with troops and weapons despite abundant evidence to the contrary. (AP Photo/Vadim Ghirda, File)
FILE - A woman votes at a polling station during the Crimean referendum to secede from Ukraine and join Russia, in Sevastopol, Crimea, on Sunday, March 16, 2014. Russia's annexation of Crimea has been seen by most of the world as an illegal land grab and recognized only by a few countries. (AP Photo, File)
FILE - Russian President Vladimir Putin gestures after signing a treaty incorporating Crimea as part of Russia in the Kremlin in Moscow, Russia, on Tuesday, March 18, 2014. Putin’s quick and bloodless seizure of Ukraine's Crimean Peninsula, home to Russia's Black Sea fleet and a popular vacation site, touched off a wave of patriotism and sent his popularity soaring. "Crimea is ours!" became a popular slogan in Russia. (AP Photo/Alexander Zemlianichenko, File)
FILE - From left, Russian President Vladimir Putin, Belarusian President Alexander Lukashenko and then-Ukrainian President Petro Poroshenko meet prior to talks in Minsk, Belarus, on Tuesday, Aug. 26, 2014. The Minsk agreement brokered by France and Germany, following painful defeats suffered by Ukrainian forces, obliged Kyiv to offer the separatist regions broad autonomy, including permission to form their own police force. (Alexei Druzhinin, Sputnik, Kremlin Pool Photo via AP, File)
FILE - Russian President Vladimir Putin, center, talks with Russian Chief of General Staff Gen. Valery Gerasimov, left, and Russian Defense Minister Sergei Shoigu after a meeting with military leaders in Moscow, Russia, Tuesday, Dec. 19, 2023. Putin has cast the conflict in Ukraine as a life-or-death battle against the West, with Moscow ready to protect its gains at any cost. (Mikhail Klimentyev, Sputnik, Kremlin Pool Photo via AP, File)
People watch a concert marking the 10-year anniversary of Crimea's annexation by Russia on Red Square in Moscow, Russia, Monday, March 18, 2024. President Vladimir Putin seized Crimea from Ukraine a decade ago, a move that sent his popularity soaring but was widely denounced as illegal. (AP Photo/Alexander Zemlianichenko)
People watch a concert marking the 10-year anniversary of Crimea's annexation by Russia on Red Square in Moscow, Russia, Monday, March 18, 2024. President Vladimir Putin seized Crimea from Ukraine a decade ago, a move that sent his popularity soaring but was widely denounced as illegal. (AP Photo/Alexander Zemlianichenko)