Sept. 19 (UPI) -- Russia launched a series of fresh attacks throughout Ukraine on Monday as Moscow persisted with retaliating for Kyiv's counteroffensive this month, which has taken away thousands of square miles from Russian forces and forced them to retreat.

Officials said that more than a dozen people were killed on Monday in new shelling attacks in the breakaway province of Donetsk, where Mayor Alexei Kulemzin confirmed that two children were among the dead.

The Russian assault targeted Kuybyshevsky, where Ukrainian soldiers have established a stronghold on the city's outskirts.

In the south, Ukrainian authorities accused Russia of "nuclear terrorism" after a missile struck early Monday close to a nuclear power plant.

Moscow takes Ukrainian orphans to place with Russian families; number killed grows