FILE – Russian defector Alexander Litvinenko, a former operative for the KGB and FSB, is seen at his home in London, on Friday, May 10, 2002. Litvinenko was viewed as a traitor by the Kremlin after fleeing to Britain in 2000. He died after drinking tea laced with radioactive polonium-210 at a hotel in London. On his deathbed, Litvinenko claimed that Russian President Vladimir Putin directly ordered his assassination. A British inquiry later found that Russian agents had killed Litvinenko, probably with Putin's approval. (AP Photo/Alistair Fuller, File)
FILE - Leonid Volkov, chief of staff for the late Russian opposition leader Alexei Navalny watches a session of the European Parliament in Strasbourg, France, on Dec. 15, 2021. Volkov had his arm broken by an attacker wielding a hammer in Vilnius, Lithuania, in March. Lithuania's security service said the assault was probably "Russian-organized and implemented." (AP Photo/Jean-Francois Badias, File)
FILE - Russian defector Maksim Kuzminov attends a news conference in Kyiv, Ukraine, on Tuesday, Sept. 5, 2023. Spanish police say the bullet-riddled body of a man found in a Spanish town was that of Kuzminov, 33, who flew a Russian military helicopter across the front lines into Ukraine last year. Sergei Naryshkin, head of Russia's foreign intelligence service, said Kuzminov became a "moral corpse" from the moment he planned his "dirty and terrible crime." (AP Photo/Vladyslav Musiienko, File)
FILE - Police officers guard a supermarket parking facility near where former spy and defector Sergei Skripal and his daughter were found critically ill following exposure to the Russian-developed nerve agent Novichok in Salisbury, England, on Tuesday, March 13, 2018. The British government accused Russia of attempted murder in the poisonings. Two men identified by authorities as carrying out the attack denied any involvement and told Russian television they were simply tourists. (AP Photo/Matt Dunham, File)
FILE - Yulia Skripal poses during an interview in London, on Wednesday, May 23, 2018. She and her father, Sergei Skripal, were found slumped on a bench in Salisbury, England, in March 2018. Sergei Skripal lived there after being released from prison in Russia in a spy swap. British investigators said they had been poisoned with a Russian-developed nerve agent and blamed Moscow for the attack. Moscow denied the allegations. (Dylan Martinez/Pool via AP, File)