KYIV, Ukraine (AP) — U.S. President Donald Trump’s special envoy Keith Kellogg said in Kyiv on Monday that officials are “working very, very hard” on efforts to end the three-year war between Russia and Ukraine, as a lack of progress fuels doubts about whether a peace settlement could be on the horizon.

U.S. President Donald Trump said on Friday that in two weeks he should know whether progress is possible in his bid to end Russia's invasion of Ukraine and he again raised the prospect of imposing sanctions on Moscow.