Pavel Podvig, Senior Researcher in the WMD Programme at UNIDIR. His current research focuses on nuclear disarmament, arms control and nuclear security:
"This all makes me nervous. Kremlin has no good off-ramps at this point and is looking at an existential threat to the current state. The thing to do at this point is for everyone, literally everyone - US, NATO, NWS, NAS, NNWS, TPNW - to say forcefully and clearly that a threat of nuclear weapons is absolutely unacceptable. ABSOLUTELY. No nuclear dick-waving, please. This might get serious. The French foreign minister's response was exactly the wrong one. You don't outnuclear Putin in this situation"