Russia sent a diplomatic document to NATO member states on Wednesday, claiming NATO is preparing an air and naval blockade of Kaliningrad and warning it would use its entire arsenal, including nuclear weapons, if the exclave is cut off. NATO Secretary-General Mark Rutte dismissed the threat as unhelpful, stating the alliance is defensive and Russia "can never win" a direct escalation. Kaliningrad, bordered by NATO members Poland and Lithuania, hosts Russia's Baltic fleet and nuclear-capable missiles.