The former Russian president, infamous for late-night online rants, is locked in a row with the US leader.

Trump orders nuclear submarines in response to Medvedev's Dead Hand threat, escalating tensions between US and Russia.

How Dmitry Medvedev went from modernising Western ally to nuclear sabre-rattler for the Kremlin

The former Russian president, infamous for late-night online rants, is locked in a row with the US leader.