Ukraine has launched a military counterattack in the southern Russian Kursk region, a move officials said was designed to stop a Russian offensive.

Russia said Sunday that Ukraine had launched a "counterattack" in the western border region of Kursk, where Kyiv's forces began a shock ground offensive last August.- Airports shut - Both Russia and Ukraine have exchanged regular attacks since the year began.

Russian forces continue to make costly but consistent gains in the Donetsk region in eastern Ukraine. They are steadily grinding down a pocket of resistance around the town of Kurakhove in the southern Donbas region and are also fighting to envelop the larger city of Pokrovsk to the north, Ukrainian soldiers and officials said.