Workers stand near charred vehicles at a parking lot in the eastern Zaporizhzhia region on Saturday, following a Russian airstrike. REUTERS

MOSCOW — US President Donald Trump spoke with his Russian and Ukrainian counterparts Vladimir Putin and Volodymyr Zelensky on Saturday to discuss the conflict in Ukraine ahead of a NATO summit in Ankara, the Kremlin and Zelensky said.

The calls were both to mark the 250th birthday of the United States, both sides said.

"This conversation, the fourth such exchange this year, was naturally not merely a routine protocol exchange but business-focused and highly constructive," said Yury Ushakov, the Kremlin's foreign policy aide.

"It allowed for a frank discussion of pressing issues on the bilateral and international agenda," Ushakov said.