President Putin made clear he knows the West is planning on supplying fighter jets to Ukraine, and that the US insists the F-16's be nuclear capable.

He pointed out that those jets, especially U.S. F-16's, require very large and complicated maintenance, which cannot now be done in Ukraine without fear of being hit with Russian missiles. Thus it would be necessary for the planes to use bases that are presently safe.

Therefore, he said, if those fighter jets takeoff from NATO bases outside Ukraine, and enter Ukraine for battle, Russia will not be able to know if those planes are armed with Tactical nuclear bombs and will have to assume THEY ARE.