Blasts shook Ukraine's capital Kyiv and other cities while neighbouring Poland scrambled its air force early on Sunday after the two countries said a Russian missile attack was under way, Paralel.Az reports citing Reuters.

"Due to the massive attack by the Russian Federation using cruise missiles, ballistic missiles and unmanned aerial vehicles on objects located, among others, in western Ukraine, Polish and allied aircraft have started operating in our airspace," the operational command of NATO member Poland's armed forces posted on X.

It said it had "activated all available forces and resources at his disposal, the on-duty fighter pairs were scrambled, and the ground-based air defence and radar reconnaissance systems reached the highest state of readiness".

Blasts were heard in Ukraine's southeastern city of Zaporizhzhia and the Black Sea port of Odesa, Reuters witnesses said, and Ukraine's air force issued air raid alerts for all of the country., although the scale of the attack was unclear.