At a summit on Thursday, Prime Minister Keir Starmer and President Emmanuel Macron also announced a “one in, one out” pilot program on migrants crossing the English Channel.

France and Britain on Thursday agreed to reinforce cooperation over their respective nuclear arsenals as the two European powerhouses seek to respond to growing threats to the continent and uncertainty over their U.

The UK and France agreed Thursday to form a nuclear deterrent pact to fend off “extreme” threats to the continent in the face of Russian aggression and fears that the US will begin to pull military support under President Trump.