Alexeyev, the deputy head of Russia’s military intelligence agency (GRU), was shot multiple times at an apartment in Moscow. He later underwent surgery. According to sources cited by news outlet Voennoedelo, quoting Telegram channel 112, the suspect fled Russia after carrying out the attack but was subsequently apprehended abroad.

Sources said Alexeyev’s condition is stable, and he is able to speak, with no immediate threat to his life.

Alexeyev is reported to have played a significant role in Russia’s military operations in Ukraine. The motive behind the shooting remains unclear, and authorities have not released further details.

The incident comes as the war in Ukraine approaches its fifth year, amid continuing concerns over regional and global security.

Separately, the head of the United Nations nuclear watchdog warned that the conflict in Ukraine remains the world’s most serious threat to nuclear safety.

Addressing the International Atomic Energy Agency (IAEA) Board of Governors, Director General Rafael Grossi said the agency remains focused on preventing a nuclear accident as ongoing fighting continues to endanger critical infrastructure, including nuclear power plants.

“The conflict in Ukraine is about to enter its fifth year,” Grossi said. “It continues to pose the world’s biggest threat to nuclear safety.”

IAEA teams remain deployed at nuclear power plants affected by the conflict and continue to provide regular updates on safety and security conditions.

The IAEA Board of Governors, the agency’s principal decision-making body, comprises representatives from 35 countries and oversees nuclear safety, security and safeguards, guiding the work of the UN nuclear watchdog. Current members include Russia, the United States, the United Kingdom and France, among others.