Could this be the first time in history a social media spat triggers nuclear escalation?

President Donald Trump, offended by posts by former Russian President Dmitry Medvedev, says he's ordered two nuclear submarines to move closer to Russia.

So, how will Moscow respond? Are we on a path to a nuclear standoff between America and Russia? An internet-age version of the 1962 Cuban Missile Crisis?

I doubt it, judging by initial reaction in Russia.

Russian news outlets have been rather dismissive of Trump's announcement.