The wave of attacks took place just 24 hours after Russia hit Ukrainian energy facilities with missiles and drones.

The Trump administration’s special envoy to Ukraine and Russia said Thursday that Ukraine “brought it on themselves” in regard to the cutoff of intelligence sharing from the US.

Before the recent restrictions imposed by the U.S., a rising tempo of Ukrainian strikes inside Russia – such as those targeting stores of ammunition — relieved pressure on Ukrainian troops on the front lines. It is one of the reasons Russia’s advances in eastern Ukraine have slowed in recent weeks, analysts say.