U.S. President Donald Trump said on Thursday that a phone call earlier in the day with Vladimir Putin resulted in no progress at all on efforts to end the war in Ukraine, while a Kremlin aide said the Russian president reiterated that Moscow would keep pushing to solve the conflict's "root causes."

The two leaders did not discuss a recent pause in some U.S. weapons shipments to Kyiv during the nearly hour-long conversation, according to a readout provided by Putin aide Yuri Ushakov, Reuters reported.

U.S. attempts to end Russia's war in Ukraine through diplomacy have largely stalled, and Trump has faced growing calls - including from some Republicans - to increase pressure on Putin to negotiate in earnest.

Within hours of the call's conclusion, an apparent Russian drone attack sparked a fire in an apartment building in a northern suburb of Kyiv, Ukrainian officials said, indicating little change in the trajectory of the conflict.