Russian President Vladimir Putin has given a stern warning to anyone threatening the national security of Russia, telling officials that those responsible will “regret their actions like they have never regretted anything before.”

Satellite images shown a build-up of Russian military hardware in the Arctic including a feared bomb that could create “radioactive tsunamis”.

In a chilling Cold War-like warning, Russia has warned the West it is not to be messed with after Joe Biden punished the nuclear superpower.

Russia is ready to sever ties with the EU if the bloc imposes new, economically painful sanctions, Russian Foreign Minister Sergei Lavrov says.

As clashes between Armenian and Azeri forces continued on Monday over the disputed Nagorno-Karabakh region, the two rivals accused each other of using Syrian militants on the battlefield – but neither provided any proof.

NATO talks in U.K. touch on everything from terrorism to China's rise