Any Ukrainian attempt to attack Crimea - which the Kremlin annexed in 2014 - will be grounds for retaliation with "absolutely any weapon", Dmitry Medvedev, the ex-president, has said. Listen to a Daily podcast special on supersonic missiles while you scroll.
European partners advance pledge for delivery of German-made Leopard battle tanks to Ukraine, saying they will be in the country by the "end of March".
Iran is reportedly preparing to sell Russia about 1,000 additional weapons, including short-range ballistic missiles and more attack drones. Updates.
Arshak Makichyan, 28, who fled Russia to Berlin in March following the invasion of Ukraine, is still pushing for climate action, but as of last week, the government says he is no longer Russian.