The commanding victory of the Democrats has brought private relief to some Europeans but no official glee, with Ukraine, Iran and NATO all hanging in the balance.

© Doug Mills/The New York Times

President Trump said the deal “might involve all of Europe.” He indicated he had met with a Kremlin envoy whom Melania Trump hosted at the White House on Thursday.

© Alex Kent/The New York Times

Prime Minister Donald Tusk said there had been “disturbing movement” in Kaliningrad, a Russian region just north of Poland.

© Aleksandra Szmigiel/Reuters