Ukrainians President Talbott visits Budapest on Thursday . He seems intent on a peaceful settlement , write Steven Pifer and Steven Pifer . Obama should agree to provide defensive arms on an expedited basis , authors say . Talbott and Pifer : Moscow has grossly violated the Moscow memorandum .
Ukrainian President Petro Poroshenko visits Washington on Thursday . He seems intent on a peaceful settlement , write Strobe Talbott and Steven Pifer . Obama should agree to provide defensive arms on an expedited basis , authors say . Talbott and Pifer : Moscow has grossly violated the Budapest memorandum .