The era of the superpower is over. The new missile and drone technologies have made naval dominance impossible and ended the ability to devastate relatively advanced nations without them being able to shoot back. There is no power in the world that has the capabilities and might of the old USSR and the USA from 1945 to 2010 or so.
We have three great powers: China, the US and Russia.
There are regional powers: Brazil and Iran and the EU and Turkey and Japan and even India, which punches way below its population numbers.
But even a backwards, bombed to hell country like Yemen can defy America’s hold on the seas.