Poland says Russian missile targeting Ukraine’s Lviv region violated its airspace while Kyiv suffers third pre-dawn attack in four days

Ukraine’s capital of Kyiv and the western region of Lviv have come under a “massive” Russian air attack, officials have said, and Polish forces have also been placed on heightened readiness.

Russia and Ukraine have been engaged in a series of deadly aerial attacks, with Sunday’s early morning strikes coming a day after the Russian military said it had seized the Ukrainian village of Ivanivske west of Bakhmut.

A militant attack on a Moscow concert hall on Friday that killed at least 133 people has also become a new flashpoint between the two arch-rivals, with President Vladimir Putin seeking to tie Kyiv to the attack; Ukraine has denied involvement and Islamic State has claimed responsibility.