PYONGYANG, North Korea — President Donald Trump’s tweets are adding fuel to a “vicious cycle” of tensions on the Korean Peninsula, North Korea’s vice foreign minister told the Associated Press in an exclusive interview Friday.

The official added that Pyongyang is ready to launch a pre-emptive strike.

Vice Minister Han Song Ryol said Pyongyang has determined the Trump administration is “more vicious and more aggressive” than that of his predecessor, Barack Obama. He added that North Korea will keep building up its nuclear arsenal in “quality and quantity” and said Pyongyang is ready to go to war if that’s what Trump wants.

Tensions between Pyongyang and Washington go back to President Harry Truman and the 1950-53 Korean War, which ended in an armistice, not a peace treaty. The heat has been rising rapidly since Trump took office in January.

This year’s joint war games between the U.S. and South Korean militaries are the biggest ever; the USS Carl Vinson aircraft carrier has been diverted back to the waters off Korea after heading for Australia; and U.S. satellite imagery suggests the North could conduct another underground nuclear test at any time. Pyongyang recently tested a ballistic missile and claims it is close to perfecting an intercontinental ballistic missile and nuclear warhead that could attack the U.S. mainland.

Many experts believe that at its current pace of testing, North Korea could reach that potentially game-changing milestone within a few years — under Trump’s watch as president.

Despite reports that Washington is considering military action if the North goes ahead with another nuclear test, Han did not rule out the possibility of a test soon.

“That is something that our headquarters decides,” he said during the 40-minute interview in Pyongyang, which is now gearing up for a major holiday — and possibly a big military parade — on Saturday. “At a time and at a place where the headquarters deems necessary, it will take place.”

The North conducted two such tests last year alone. The first was of what it claims to have been a hydrogen bomb and the second was its most powerful ever.

The annual U.S.-South Korea military exercises consistently infuriate the North.

Trump posted a tweet Tuesday in which he reiterated his call for more pressure from Beijing, North Korea’s economic lifeline, to clamp down on trade and strengthen its enforcement of U.N. sanctions.