Island nations like Greece, Britain, Japan traditionally have powerful navies.
Greece in modern times never had a powerful navy.
Japan in its entire history never had a strong navy compared to China and Korea. Only time they were strong was in the the modern times from late 1800s to the end of World War 2.
Britain was able to have a strong navy from the 1700s all the way to the end of world war 2. But in the Cold War they were still a formidable naval power.
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