US President Donald Trump on Friday ordered that two nuclear submarines be positioned in regions near Russia, in response to threats from the deputy chairman of Moscow's Security Council, Dmitry Medvedev.

"Words are very important, and can often lead to unintended consequences, I hope this will not be one of those instances," Trump said in a Truth Social post, clarifying that his move was a response to the former Russian president's provocative statements.

Medvedev had earlier ridiculed the US president's 'dead economies' remark in a Telegram statement, in which he also warned Washington of Russia's 'Dead Hand'.

(This is a developing story.)

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