Osechkin founded a rights group for prisoners years ago and runs a project that exposes abuses in Russia’s prison system, but he said the threats against him escalated after he began investigating alleged Russian abuses in Ukraine and helping Russian military defectors flee.

Ukraine's air force said that Russia also continued its long-range attacks overnight. The air force said on Telegram that Moscow launched 102 drones into the country overnight, of which 92 were intercepted or suppressed. Eight drones impacted across six locations, the air force said.