It has taken several months, but the Russian Particulars of Claim and Ukraine's Defence (akin to complaint and answer in U.S. civil procedure) have now been filed. Distilled to its essence, Ukraine's response, as the Financial Times notes, is that "if you wanted your money back you should not have invaded our country." Or as Ukraine's lawyers put it in the Defence: "The [Russian] claim forms part of a broader strategy of unlawful and illegitimate economic, political and military aggression ... aimed at frustrating the will of the Ukrainian people to participate in the process of European integration."
Russia's version of events is straightforward and looks like any other debt case: Russia lent the money, Ukraine committed a breach of contract by not repaying. Ukraine, by contrast, will have a harder time translating its defenses into the dry language of legal doctrine. But it can be done. As I have written here at Credit Slips, and in more detail elsewhere, contract law provides Ukraine with a number of potentially viable arguments. Now that we know the arguments asserted by Ukraine, here are some preliminary thoughts.