FILE - Ukrainian soldiers fire a cannon near Bakhmut, an eastern city where fierce battles against Russian forces have been taking place, in the Donetsk region, Ukraine, on May 3, 2023. Two years after Russia’s full-scale invasion captured nearly a quarter of the country, the stakes could not be higher for Kyiv. After a string of victories in the first year of the war, fortunes have turned for the Ukrainian military, which is dug in, outgunned and outnumbered against a more powerful opponent. (AP Photo/Libkos, File)