Is The U.S. Prepared For The Possibility That Putin Uses Nuclear Weapons?

FOX News: US doesn't 'seem prepared' for possibility that Putin uses nuclear weapons: expert  

Russia claimed on Saturday to have launched a hypersonic missile 

The United States’ reactionary moves to Russia’s invasion of Ukraine suggest that it does not have an adequate plan in place to respond if Russian President Vladimir Putin decides to use a nuclear weapon, a former U.S. intelligence officer told Fox News. 

Rebekah Koffler, a former U.S. Defense Intelligence Agency agent and author of "Putin's Playbook: Russia's Secret Plan to Defeat America," explained to Fox News that while the U.S. certainly has a strategic plan in place if Putin uses a nuclear weapon, recent responses to Russia’s aggression instill little confidence that the United States is doing the necessary preparation for such an outcome.  

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WNU Editor: The U.S. better be prepared. Russia's nuclear forces have been on high alert since the invasion .... Putin puts nuclear forces on high alert, escalating tensions (AP).  

Update: If Russian President Putin decides to use a tactical nuclear weapon in Ukraine, this "hotline" is going to be busy .... Pentagon sets up hotline with Russia to avert Ukraine ‘miscalculation’ (The Guardian/Reuters). But what happens if no one answers?