Putin draws a nuclear red line for the West

Putin extended the list of scenarios that could lead to Russia using nuclear weapons 

Russian President Vladimir Putin has drawn a 'red line' for the United States and its allies. Picture: Valery Sharifulin, Sputnik, Kremlin Pool, AP)

President Vladimir Putin has drawn a "red line" for the United States and its allies by signalling that Moscow will consider responding with nuclear weapons if they allow Ukraine to strike deep inside Russia with long-range Western missiles.

But some in the West are asking: does he actually mean it?