MOSCOW/KIEV, July 16 (Xinhua) -- Russia on Tuesday rejected U.S. President Donald Trump's 50-day ultimatum to agree to an Ukraine ceasefire, dismissing the threat of "severe tariffs" as unacceptable.

WASHINGTON, July 15 (Xinhua) -- U.S. President Donald Trump appears to be losing patience with his Russian counterpart, Vladimir Putin, voicing disappointment on Monday just hours after threatening ...