Russian forces have expelled the Ukrainian military from the largest town in Russia's Kursk border region, Sudze, the Russian Defense Ministry said.
The AP states that it was unable to independently confirm this information, and Ukraine has not yet commented.
This came as US officials await the Kremlin's response to the proposed 30-day ceasefire that Ukraine has accepted.
The seven-month-old stronghold of the Ukrainian army in Kursk has been under intense pressure for months from the Russian army, which has once again launched an offensive with the help of the North Korean army.
Ukraine's incursion into Kursk is the first foreign occupation of part of Russian territory since World War II, which, according to the AP, has embarrassed the Kremlin.
Ukraine's goal was to draw the Russian army away from the front in Ukraine and use the occupation in negotiations, but the incursion did not significantly change the dynamics of the war.
Russian President Vladimir Putin visited the military headquarters in Kursk on Wednesday and spoke with military commanders there.
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