Russia accused Ukraine of launching drone attacks that sparked a fire at a nuclear power plant in its western Kursk region overnight Sunday.

It comes as Ukraine is celebrating its independence day on Sunday, which marks the country's declaration of independence from the Soviet Union in 1991. The United Nations' International Atomic Energy Agency (IAEA) has repeatedly called on both Russia and Ukraine to show maximum restraint around nuclear facilities in the war.

Russia accused Ukraine on Sunday of striking one of its nuclear power plants in an overnight drone attack that caused no increase in radiation levels. The alleged attack sparked a fire at the Kursk Nuclear Power Plant near the Russia-Ukraine border,