The official said any agreements on either matter would be contingent on Russia removing threats to Ukraine and that no decisions would be made without the consent of Ukraine or NATO.
Secretary of State Antony Blinken and German Foreign Minister Annalena Baerbock sought to present a unified front on Russia after a meeting in Washington.
President Joe Biden has warned Russian President Vladimir Putin that Washington could impose new sanctions against Moscow if it takes further military action against Ukraine.
Joe Biden’s arrival in the White House nearly a year ago seemed to herald a historic shift toward less U.S. reliance on nuclear weapons and possibly a shrinking of their numbers.