The Russian military suffered record casualties in Ukraine last month, with more than 54,000 troops killed and heavily wounded, according to President Volodymyr Zelenskyy.

Kyiv's forces have regained more territory than Russia was able to seize for the second month running, including losing territory in the key eastern Donbas region.

Russia has gained less than 1,000 square kilometers of Ukrainian territory since the beginning of this year, a sharp decline from the same period last year, according to a Ukrainian open-source collective.