Dmitry Medvedev, the former Russian president, has engaged in a heated social media exchange with Donald Trump, prompting the latter to announce the repositioning of U.S. nuclear submarines.

One former Russian army man says it's just how Donald Trump 'gets his kicks' as they called his comments 'meaningless' ...

The manoeuvres, part of the “Maritime Interaction-2025” drills, involve a large Russian anti-submarine ship, two Chinese ...