Analysis of information sources in references of the Wikipedia article "Βασιλικό Ναυτικό (Ηνωμένο Βασίλειο)" in Greek language version.
...the United States and the United Kingdom have the world's two best world-spanning blue-water navies... with the French being the only other candidate... and China being the most likely competitor in the long term
Britannia, with her shield and trident, is the very symbol, not only of the Royal Navy, but also of British global power. In the last instance, the Royal Navy is the United Kingdom's greatest strategic asset and instrument. As the only other 'blue-water' navy other than those of France and the United States, its ballistic missile submarines carry the nation's nuclear deterrent and its aircraft carriers and escorting naval squadrons supply London with a deep oceanic power projection capability, which enables Britain to maintain a 'forward presence' globally, and the ability to influence events tactically throughout the world.
Britannia, with her shield and trident, is the very symbol, not only of the Royal Navy, but also of British global power. In the last instance, the Royal Navy is the United Kingdom's greatest strategic asset and instrument. As the only other 'blue-water' navy other than those of France and the United States, its ballistic missile submarines carry the nation's nuclear deterrent and its aircraft carriers and escorting naval squadrons supply London with a deep oceanic power projection capability, which enables Britain to maintain a 'forward presence' globally, and the ability to influence events tactically throughout the world.