Key developments on April 3: Zelensky: Russia preparing to mobilize additional 300,000 troops by June Ukraine, Finland sign long-term security agreement Zelensky: Russia launched over 4,000 missiles, Shahed drones, guided aerial bombs on Ukraine in March Military intelligence: Russia has roughly 200 Su-34, Su-35 jets, 7 A-50 planes Politico: Allies consider moving Ramstein group under NATO control to shield it from Trump Russia is preparing to mobilize an additional 300,000 troops by June 1, President Volodymyr Zelensky said during a joint press conference in Kyiv with Finnish President Alexander Stubb on April 3.