By Steve Holland, Tom Balmforth and Yuliia DysaWASHINGTON/KYIV (Reuters) -U.S. President Donald Trump on Tuesday said Vladimir Putin was "playing with fire" by refusing to engage in ceasefire talks with Kyiv as Russian forces made gains in Ukraine's northeast.

A Ukrainian official said Monday that an overnight Russian drone attack on Ukraine was the biggest of the three-year war.

The attack was the largest aerial assault since Russia’s full-scale invasion of the country in February 2022, according to Ukrainian officials.