Do you remember the threads about the supposed Chinese sub launching an ICBM off the coast of CA that was recorded by a helicopter pilot? He recorded it for 10 minutes. There were threads hundreds of posts long. Some thought it was just a contrail looking head on. Some thought it was a super slow speed missile. It was a story from World Net Daily.
FReegards
Any sub that launched an ICBM off the US coast without prior notification would be sunk and the nation that did it would face the potential of massive retaliation.
Why would any nation risk all-out nuclear war with the US?
Not plausible.