Democratic and Republican U.S. senators who have been negotiating for weeks on a bipartisan bill to punish Russia for its troop build up near Ukraine said they have reached an impasse, although aides said on Friday they continue to look for a way forward.
Senators from both parties had said for weeks they wanted to act quickly to boost Ukraine with sanctions on Russia and more military assistance for Kyiv, in what seemed to be a rare incidence of bipartisan cooperation in a bitterly divided Congress.
