Poland's President Andrzej Duda again called on the United States to deploy nuclear weapons to Poland as a deterrent to Russia, the latest indication that the frontline NATO nation is increasingly considering nuclear protection as fears of Russia grow.

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 as it faces Russia. Viewed from Poland, President Putin's Russia is a clear and a present danger.