Russia possesses the world’s largest nuclear arsenal (5,580 warheads) and has repeatedly threatened escalation over the Ukraine war. -While the probability of use remains low, four main delivery systems are likely candidates for a “limited” tactical nuclear strike.

Ukrainian President Volodymyr Zelenskyy on Wednesday dismissed Russia’s ceasefire proposal as “an ultimatum” and renewed his call for direct talks with Russian President Vladimir Putin to break the deadlock over the war,