Russia launched a barrage of drones and ballistic missiles across broad swaths of Ukraine early Friday, killing at least six people and injuring dozens of others, days after Kyiv launched a daring raid on Moscow’s fleet of strategic bombers.

Russia launched a wave of attacks against Ukraine on Friday, hitting the Eastern European country in several cities, including its capital, Kyiv. In Kyiv, four people were reportedly killed (though there were conflicting reports on that number) and 20 others were injured as Russia bombarded the Ukrainian capital with missiles and drones,

The attack on Friday, which killed at least four people nationwide, came two days after Russia vowed retaliation for an audacious drone assault on its strategic bomber bases.