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.

WASHINGTON—President Trump expressed renewed frustrations with Russian President Vladimir Putin, saying the Russian leader was “playing with fire” as peace talks with Ukraine have sputtered. “What Vladimir Putin doesn’t realize is that if it weren’t for me,