More likely Russia will destroy its own fleet to “pre-empt American imperial aggression”.
Yes, The NATO forces will do this once they Join the fight. It will be a Russian Pearl Harbor, Then take out the Baltic Fleet and the Russian Naval Base in Syria. You can’t leave Russia with any ships that might carry nukes—because major cities in Europe would be targets. The USN will be tasked with taking out all the subs in the Atlantic—should be simple—They have noisy subs—easy to find and sink. In 24 hours Russia will have no fleet. It will not take a nuke to get that response. The West is spoiling for a fight so any little thing can spark it off.