The Security Service of Ukraine says 110 Ukrainian citizens remain prisoners of the enemy. Yurii Tandyt, advisor of the SBU head, announced this live 112 Ukraina television channel, Ukrainian News Agency reports. According to him, another 490 citizens are registered as missing. Yurii Tandyt says nearly 3,100 citizens have been freed or found. As Ukrainian News Agency earlier reported, Russian President Vladimir Putin says the swap of prisoners of war in the format "all for all" is possible in case Ukraine pardons all convicted militants.