European allies are advancing contingency planning for a potential post-ceasefire security mission in Ukraine, with the most recent catalyst being the October 2026 announcement of joint military exercises. At least 1,500 British, French, and German troops will join Polish forces in Poland during November to rehearse troop movements, logistics sustainment, and multinational operations aimed at deterring renewed Russian aggression under a future ceasefire. These drills, coordinated through the UK- and France-led Coalition of the Willing, build on earlier discussions and reflect European efforts to develop security guarantees independent of direct U.S. combat involvement. NATO’s broader defense planning against Russian threats to alliance territory continues in parallel, while U.S.-Russia diplomatic signals add uncertainty to timelines for any negotiated settlement.