The mayor of Kiev asked residents not to leave the shelter
Several explosions rocked the city of Kiev and the entire Ukraine was put on alert as Russia launched a wave of air strikes.
Poland says it has activated its air force to ensure the safety of Polish airspace after strikes also targeted the Ukrainian border region of Lviv.
The attacks began in the capital at 05:00 (03:00 GMT).
The Ukrainian army said that its air defense systems participated in repelling the attack.
Serhiy Popko, head of the military administration in Kiev, said that about ten Russian missiles were destroyed over the capital and its surrounding areas.
He added in a statement on the Telegram application that there were no reports of casualties or serious damage as a result of the attacks.
Andrei Sadovy, Mayor of Lviv, said via the Telegram app that the city itself was not bombed. However, around 20 missiles and seven attack drones were launched into the wider Lviv area, targeting “critical infrastructure”.
Ukraine was earlier put on nationwide alert, warning of the launch of cruise missiles from Russian strategic bombers.
Meanwhile, the Operations Command of the Polish Armed Forces (RSZ) said: “Polish aircraft and allied forces have been activated.
He added: “All necessary measures to ensure the security of Polish airspace have been activated, and the RSZ forces are constantly monitoring the situation.”
Kiev residents were filmed taking shelter in metro stations.
Moscow has not yet commented on Sunday's strikes.
The governor of the port of Sevastopol in the Russian-annexed Crimean peninsula said that Russian forces shot down ten Ukrainian missiles over the city late Saturday evening.
Mikhail Razvozaev said on the Telegram application that an administrative building and a gas line were destroyed, and a woman was injured by shrapnel.
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