This week marks the four-year anniversary of Russia's full-scale invasion of Ukraine. Brussels Sprouts wanted to mark this somber milestone with a look at the conflict and the ongoing efforts to secure a durable end to the war. Even as the war in Ukraine shows no signs of an imminent end, the international community, and the allies in Europe in particular, have been working on the foundations of a credible security guarantee for Ukraine once the fighting ends. Part of this line of effort has been the proposed creation of a multinational force, which could be deployed to Ukraine once the hostilities cease to serve as a visible reassurance force. Perhaps more critically, the multinational force could help Ukraine regenerate its military forces and strengthen its own ability to deter further Russian aggression.