As of April 29, 2026, Japan’s Ministry of Foreign Affairs released a message from Prime Minister Sanae Takaichi for the 11th Three Seas Initiative (3SI) Summit in Dubrovnik, emphasizing that stable energy supply and resilient supply chains are essential for regional peace and economic stability amid global uncertainty. [1] The statement highlighted the growing importance of strengthening north–south connectivity across Central and Eastern Europe—particularly in energy, infrastructure, and digital sectors—and noted alignment between the 3SI framework and Japan’s “Free and Open Indo-Pacific” principles, including rule of law, openness, and inclusiveness. Japan reaffirmed its role as a strategic partner (since 2024) and its intention to deepen cooperation with participating countries across these sectors, signaling continued engagement in European energy and infrastructure development corridors.

[1] https://www.mofa.go.jp/erp/erp_2/hr/pageite_000001_01605.html