Should every navy worried about submarines buy the P-8 Poseidon?
Short answerNo; P-8 is especially strong for Atlantic operations, while P-1 or retained P-3 aircraft may suit the Baltic and Mediterranean better.
NotesThe P-8 is praised for the range and coalition commonality needed in the North Atlantic. The Japanese P-1 may offer a more proportionate option for the Baltic or Mediterranean, where patrol geometry and distance differ. Existing P-3 aircraft can also remain useful in those confined theaters. Maritime-patrol procurement should follow geography and alliance operations instead of a universal platform ranking.