Last week, the Ukrainian government published a report about postwar security guarantees for its country.

Compiled by an international group of current and former government officials, the document seeks to outline a security framework that would safeguard Ukraine from renewed Russian aggression until the country’s formal accession into the European Union and NATO. Among the many countries specifically mentioned as desired security guarantors was Japan.

That may come as a surprise to many. After all, due to its peace Constitution Japan is limited in its ability to exercise collective self-defense and has not signed onto any security treaties other than with the United States.