They called Washington’s plan “a basis” that required further work in a joint statement on Saturday after talks at the G20 in South Africa. “I feel very optimistic that we can get something done here, because we made a tremendous amount of progress,” Mr Rubio told reporters, adding that talks would continue on Monday. Mr Rubio said earlier that US and Ukrainian teams were “making some changes” in the hope of “narrowing the differences” between the US and Ukraine. The US State Department dismissed as “blatantly false” claims from senators that Mr Rubio told them the plan was a “wish list” from Russia. This and his one-on-one discussions with Mr Trump on Ukraine make it clear to that the US leader wants a “just and lasting peace”, the Prime Minister said.