The Prime Minister spoke to the President of the United States, Donald Trump, this afternoon.
The leaders discussed Euro-Atlantic security and agreed on the need to deter an increasingly aggressive Russia in the High North.
European Allies had stepped up in recent months to defend Euro-Atlantic interests, but more could be done to protect the area, the Prime Minister said.
The leaders looked forward to speaking again soon.
(Contains public sector information licensed under the Open Government Licence v3.0)