It said the attack was directed against "a strongpoint and concentration of Ukrainian Armed Forces personnel", and the bombs were delivered by a Russian Su-34 warplane.
Reuters could not independently verify the strike, and the defence ministry's brief statement did not give any details on the impact.
A Russian Su-34 warplane delivered the glide bombs that targeted Ukraine soldiers in Kursk. (AP PHOTO)
Ukraine caught Moscow by surprise on August 6 by bursting across the border into the Kursk region, in the first invasion of Russian sovereign territory since World War Two.
Russia has been trying for more than two months to eject the Ukrainian forces. Earlier on Sunday, the defence ministry in Moscow said it was pursuing offensive operations at several dozen locations in the region.
As of early September, Ukrainian President Volodymyr Zelenskiy said his forces controlled more than 1300 sq km of Kursk, including 100 settlements. On Saturday he said Russian forces had tried to oust Ukrainian troops "but we are holding the designated lines".
Russia said its forces had taken back several villages last week.
If Ukraine can hold on to its slice of Kursk, it will be in a better position for peace talks. (EPA PHOTO)
The outcome of the fighting in Kursk could have a significant impact on the course of the war that began with Russia's full-scale invasion of Ukraine in February 2022.
If it can hold on to a slice of Russian territory, Ukraine will have a valuable bargaining chip in any future peace negotiations.
On the other hand, its decision to commit a substantial force to the Kursk offensive has come with a price elsewhere on the battlefield, as Russia advanced in eastern Ukraine at its fastest pace for two years in August and September.
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