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The US Navy ended President Donald Trump's trip to Asia with a display of strength by having three aircraft carriers drill with South Korean and Japanese navy ships in the Pacific in a clear message to North Korea.
The US Navy rarely gets to train with two aircraft carriers working together, and the last time three came together was 10 years ago.
But the US now has seven aircraft carriers at sea and brought three of them together to put on a show of force.
The ships did air-defense drills, sea surveillance, and defensive air-combat training, according to a US Navy release.
Between the three US carriers and one smaller Japanese carrier, the naval formation likely had more than 200 aircraft ready to strike at a moment's notice.