Expanding the nuclear-sharing program to Warsaw would send a clear message to Putin: any attack on Poland would be a catastrophic mistake.

Polish President Duda urges the US to transfer nuclear weapons to Poland, citing NATO's need to adapt its deterrence strategy to its expanded eastern borders.

The president of Poland, Andrzej Duda, has repeated his call for the US to base nuclear weapons on Polish soil. In the presidential palace in Warsaw, he told me that it would make Poland stronger and safer,