Is Putin bluffing when he hints that he’s prepared to use nuclear weapons to win his war there?

President Putin has announced a call-up of 300,000 Russian reservists to fight in Ukraine.

Clearly his invasion has not been going to plan, but Mr Putin told his people the West is carrying out “nuclear blackmail” on Russia, and warned that he wasn’t bluffing when he said Russia could use any weapon in its armoury in retaliation.

We speak to Ken Adelman, former Arms Control Director under President Ronald Reagan, and Patricia Lewis, Director of International Security at Chatham House.