What would it take to force Russia's hand in declaring war on the USA?

It's common belief that if the US and Russia don't want to go to war because even though the US would win more times then not it would all come to down using nukes where nobody would win. Can you give me situation in which Russia has no choice but to declare war against the US even if they don't want to? show more It's common belief that if the US and Russia don't want to go to war because even though the US would win more times then not it would all come to down using nukes where nobody would win.

Can you give me situation in which Russia has no choice but to declare war against the US even if they don't want to?
4 answers 4