Ukraine President Volodymyr Zelenskyy said he spoke by phone with U.S. President Joe Biden about Washington’s future support for Kyiv, and Russian President Vladimir Putin visited a military base near the Ukrainian border, as the warring countries laid plans for the winter and next year’s combat operations.

Almost 20 months of war have sapped both sides’ military resources. The fighting is likely to settle into positional and attritional warfare during the approaching wintry weather, analysts say, with little change along the more than 1,000-km front line.