The Kalibr submarine-launched cruise missile is one of several methods that the Russians will use to retaliate against the Ukrainians for their attack on Russian airbases deep inside the country.

Kyiv, Ukraine — Russia bombarded six regions of Ukraine in one of its largest aerial attacks of the three-year war, Ukrainian officials said Friday. The nighttime assault lasted for hours and killed three emergency responders in the capital Kyiv, according to authorities.

Russia's latest missile and drone strike comes less than a week after Ukraine's successful Operation Spider's Web against Russia.