Ukrainian President Volodymyr Zelenskyy says he will urge allies to boost his country's air defenses at a meeting this week in Germany.

Ukraine has launched a counterattack in the southern Russian border region of Kursk, warning that Russia is “getting what it deserves.”

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.

Ukraine has launched a fresh offensive in Russia's Kursk region, the Russian defence ministry says. In a statement, the ministry said efforts to destroy the Ukrainian attack groups were ongoing. Officials in Ukraine have also suggested an operation is under way.

The Kremlin on Saturday vowed "retaliation" for what it said was Ukraine's use of American-made Army Tactical Missile Systems against targets in a Russian border region.

Ukraine appeared to launch a fresh offensive Sunday in Russia’s border region of Kursk, where Kyiv’s forces have held territory for several months.