Moscow vows to retaliate against Kyiv directly for any strikes on Russian soil

Russia on Friday vowed to ramp up attacks on Kyiv in response to military strikes against targets within Russia's borders.

"The scale of missile strikes by the Russian Armed Forces on objects in Kyiv will be increased in response to any attacks or sabotage on Russian territory," the Russian Ministry of Defense said, according to Russian state-owned outlet RIA News.

Russia invaded Ukraine on Feb. 24. The Ukrainian military has since begun launching raids on Russian soil. In early April, Ukrainian attack helicopters entered Russian airspace and struck an oil depot in Belgorod, per the Wall Street Journal.

Sirens blared across Ukraine last night as Moscow attacked targets in every oblast, even in the country's western edges, far from the battle lines. Several explosions rocked the capital city of Kyiv.

Ukrainian MP Lesia Vasylenko speculated the attacks were the result of Putin going "livid because of the [Moskva] sinking." Ukraine claimed to have sunk the Russian warship Moskva in the Black Sea on Thursday. Russia meanwhile, asserted that the ship sank in a storm following the explosion of its ammunition supply.