Despite a troop shortage, Ukraine's military said it had retaken two villages in the eastern region of Sumy on Monday, part of a small reversal in more than a year of slow, attritional Russian gains in the southeast.

Ahead of a summit in Alaska between Trump and Putin, Russian troops continued their campaign to take full control of Ukraine's Donetsk region.

Russian forces drove deeper into eastern Ukraine on Tuesday, pressing toward the coal-mining town of Dobropillia in one of their most significant