Russia has reportedly launched a barrage of hypersonic and cruise missiles against Ukrainian targets, causing damage and claiming lives near the front lines of fighting in the east.

Officials said Monday that at least four civilians had died in the attacks and at least 30 more people were injured.

Western analysts had previously cautioned that Moscow was stockpiling its cruise missiles in preparation for a strategy of winter bombardment, as bad weather keeps the 1,500-kilometer front line mostly static after 22 months of war.

Officials say that last winter the Kremlin’s forces targeted Ukraine’s power grid, but are now aiming at Kyiv’s defense industry.

However, the barrages have repeatedly hit civilian areas.