President Emmanuel Macron said Monday that France would expand its nuclear arsenal and deepen cooperation with European neighbors to deter attacks, a landmark shift in its nuclear doctrine that reflects how an aggressive Russia and a retreating United States are redrawing the security contours in Europe.

L'ILE LONGUE, France -- French President Emmanuel Macron announced Monday that France would allow the temporary deployment of its nuclear-armed aircraft to allied countries as part of its new nuclear strategy.

Add Yahoo as a preferred source to see more of our stories on Google. France will on Monday unveil how it could use the European Union's only atomic arsenal to protect the continent in an unstable world, with Russia becoming increasingly aggressive and the United States turning away.