Since the outbreak of the Russia-Ukraine conflict,Japan's foreign strategy has seen several new changes.In terms of foreign policy,Japan has aligned with Western countries in maintaining a tough stance against Russia,implementing multiple sanctions.At the same time,Japan has actively developed its partnership with Ukraine,providing assistance in various areas including finance,humanitarian aid,refugee support,post-war reconstruction,and military equipment.Japan has also engaged in shuttle diplomacy to increase its international influence.In terms of security policy,Japan has attempted to use the Russia-Ukraine conflict to advance its military expansion plans,continuously challenging the baseline of its exclusively defensive posture and intending to undermine the long-held"Three Non-Nuclear Principles".On the other hand,Japan has exaggerated tensions in East Asia,promoting the"China threat"theory,continuously strengthening security cooperation with the West,expanding its influence,and enlarging its security space,attempting to justify the containment of China.However,Japan's sanctions against Russia will inevitably have adverse effects on both parties,and the strategic games between Japan and Russia on the issue of the Russia-Ukraine conflict will continue.Japan's new security policy will also increase the risk of regional security conflicts,but it will be constrained by domestic budgetary limits and anti-war sentiments.