Core Viewpoint - Japan's constitutional Article 9 restricts overseas military deployment, requiring specific conditions to be met for any military action, which have not been previously activated [2][4][5]. Group 1: Legal Framework and Military Actions - Japan's government is discussing potential responses by the Self-Defense Forces (SDF) due to the blockade of the Strait of Hormuz by Iran, but current legal frameworks make it difficult to fulfill U.S. expectations for troop deployment [2][4]. - The SDF has never operated in combat zones, and any action in the Persian Gulf is deemed unrealistic under current constitutional constraints [4][5]. - Actions such as mine-sweeping and vessel protection could be interpreted as the use of force under international law, which complicates Japan's ability to engage militarily [4][5]. Group 2: Conditions for Military Engagement - For Japan to engage in military action, it must classify the situation as a "survival crisis" or an "important influence situation," both of which require a legal basis that has not been previously established [5][6]. - Any military cooperation with the U.S. against Iran would necessitate a justification under international law, which is currently weak due to the lack of a UN resolution supporting U.S.-Israeli actions [5][6]. - Japan's past military actions were based on international cooperation under UN resolutions, such as support during the Gulf War and the Iraq War, which are not applicable in the current context [5][6]. Group 3: Current Military Deployments and Diplomacy - Japan has deployed the "Yuudachi" destroyer and P-3C patrol aircraft for intelligence-gathering missions in the region, operating under the Defense Ministry's investigative provisions [6]. - Recent diplomatic efforts include discussions between Japan's Foreign Minister and Iran's Foreign Minister, emphasizing the need for Iran to ensure the safety of vessels in the Strait of Hormuz [6].