President Trump on Sunday issued a warning not to underestimate U.S. resolve as he launched his Asia trip.

“For almost 60 years, the military alliance we see on this base has endured — a cornerstone of sovereignty, security and prosperity for our nations, this region and indeed the entire world,” Trump said to U.S. service members at Yokota Air Base in Fussa, Japan.

“We dominate the sky, we dominate the sea, we dominate the land and space,” he added. “Each of you embodies the warrior creed. Your devotion, prowess, and expertise make you the most fearsome fighting force in the history of our world.”

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Trump said the U.S. military and the nation’s allies are “prepared to defend our nation using the full range of our unmatched capabilities.”

“No one — no dictator, no regime, and no nation — should underestimate, ever, American resolve," he said. "Every once in a while, in the past, they underestimated us. It was not pleasant for them, was it? It was not pleasant."

“We will never yield, never waver, and never falter in defense of our people, our freedom, and our great American flag,” he added.

While Trump did not mention Kim Jong Un by name, the North Korean leader is expected to be a key focus of the president’s discussions during the trip.

Trump said ahead of a dinner with Japanese Prime Minister Shinzo Abe that discussions would focus on Pyongyang and trade.

The president also told reporters aboard Air Force One during the trip to Japan that he plans to meet with Russian President Vladimir Putin about North Korea.

“We want Putin’s help on North Korea, and we’ll be meeting with a lot of different leaders," Trump said.