Moscow’s actions came two days after Russian President Vladimir Putin signed a decree lowering the threshold for using nuclear weapons.
Ukraine this week fired Western-supplied long-range missiles into Russian territory for the first time.
The latest round of saber rattling from Putin and Kim has come during a week in which the war in Ukraine passed 1,000 days and with Washington preparing for a change in leadership.
China has called on "all parties" to remain calm and exercise restraint following Russia's strike on the city of Dnipro with a new ballistic missile and Kremlin leader Vladimir Putin's threats to Western countries about the use of weapons against them.