If a summit does happen and the Trump administration doesn't come away it with clear deliverables, it's a win only for Putin, according to Ambassador Bill Taylor, a former U.S. ambassador to Ukraine under President George W. Bush and President Barack Obama who also served as chargé d'affaires to the country during the first Trump administration.

President Donald Trump’s deadline for Russia to end its war in Ukraine or suffer severe economic punishment expires Friday, but it’s unclear how he plans to proceed amid new efforts toward a summit with Vladimir Putin and delicate trade negotiations with China.