Russian President Vladimir Putin is reportedly arresting top Russian intelligence and military officials as his invasion of Ukraine remains stalled outside of some major cities, most notably the Ukrainian capital of Kyiv.

Russian authorities have reportedly detained two top intelligence officials and at least eight military leaders since Russia’s invasion of Ukraine began in late February, according to the U.K. publication The Times. Reports of the crackdown comes as the war in Ukraine stretches into its third week with the Russian military stalled outside of a number of major Ukrainian cities.

Authorities have arrested Sergey Beseda, who heads the foreign intelligence division of the FSB, a successor to the Soviet Union’s KGB. Anatoly Bolyukh, Beseda’s deputy, was also arrested, reported Andrei Soldatov, co-founder and editor of the investigative outlet Agentura.