In this episode of The PDB Afternoon Bulletin: South Korea says it has intelligence that Russia may have secretly supplied North Korea with nuclear reactor modules for submarines. If true, it would represent a dangerous leap forward for Pyongyang’s military capabilities and a major escalation in Moscow’s ties with the regime. Israel declares its new laser defense system, the Iron Beam, operational. Officials say it’s a historic milestone—promising to shoot down rockets and drones at the speed of light and at a fraction of the cost of traditional interceptors.