It's our understanding that the Russians are going to write up terms for what they would require in order to reach a ceasefire that then would allow broader negotiations,' Rubio told the Senate Committee.

By Patricia Zengerle, Daphne Psaledakis and Simon Lewis WASHINGTON (Reuters) - U.S. Secretary of State Marco Rubio on Tuesday insisted that the country is not withdrawing from the world, as he batted away criticism of cuts to aid and diplomatic budgets from former colleagues in Congress,