U.S. President Donald Trump attends a press conference following the second U.S.-North Korea summit in Hanoi, Feb. 28, 2019.
U.S. President Donald Trump attends a press conference following the second U.S.-North Korea summit in Hanoi, Feb. 28, 2019.

President Donald Trump says the reason he canceled large-scale springtime military drills with South Korea is to save "hundreds of millions of dollars" that the U.S. is never reimbursed.

"That was my position long before I became president," Trump tweeted Sunday while adding "reducing tensions with North Korea at this time is a good thing."

Pentagon officials say instead of the massive war games, the U.S. and South Korea will hold a series of small-scale exercises.

Washington and Seoul have traditionally held the exercises every spring to test military readiness in case tensions with North Korea should boil over.

The war games have always angered the North, which usually responded with its own military exercises. North Korea has denounced the U.S., South Korea joint exercises as aggressive provocations and rehearsals for war.

Meanwhile, National Security Advisor John Bolton was all over the Sunday morning talk shows to say last week's summit between Trump and North Korean leader Kim Jong Un was not a failure, even though talks fell apart with no agreements.

"He's not desperate for a deal – not with North Korea, not with anybody if it's contrary to American national interests," Bolton told Fox News Sunday, while also telling CBS's Face the Nation. "The president held firm to his view. He deepened his relationship with Kim Jong Un. I don't view it as a failure at all when American national interests are protected."

National security adviser John Bolton listens duri
FILE - National security adviser John Bolton listens during a press briefing at the White House, Jan. 28, 2019, in Washington.

Bolton said Kim was willing to make "a very limited concession" to dismantle its Yongbyon nuclear weapons complex in exchange for "substantial" sanctions relief.

Bolton described Yongbyon as "an aging nuclear reactor and some percentage of their uranium enrichment plutonium reprocessing capabilities." He said Kim was unwilling to make a "big deal" with Trump.

"It was the sanctions that brought the North Koreans to the table. It's the sanctions they want relief from and relief they can get if they denuclearize," Bolton said.

FILE - Flags of North Korea and the U.S are flown on a street in Hanoi, Vietnam, Feb. 19, 2019.
Experts: 'Experience Matters' in Negotiating With North Korea
The American team’s lack of experience in negotiating with North Koreans, as well as a lack of preparation, may have contributed to the collapse of this week’s Hanoi summit between Kim Jong Un and President Donald Trump, who favors top-down diplomacy, according to experts.The two-day summit that began Wednesday ended when Trump walked out on Thursday without a denuclearization deal or a declaration of peace to end the Korean War, a move met with approval in Washington, even though the summit began…

Bolton conceded that North Korea is continuing to produce nuclear fuel and said while "there is no expiration date" on further talks, future negotiations with North Korea are in limbo.

Bolton also appeared on CNN's State of the Union, where he defended Trump who said he took Kim "at his word" when the North Korean leader claimed knew nothing about the alleged torture of imprisoned U.S. student Otto Warmbier.

The Ohio student fell into a coma in a North Korean prison and died shortly after he was sent home two years ago.

Bolton said while Trump accepts what Kim said, it does not mean he accepts it as reality.

"The president's been very clear he viewed what happened to Otto Warmbier as barbaric and unacceptable and I think the best thing North Korea could do right now would be to come up with a full explanation of exactly what happened to him," Bolton said on CNN.

The Democratic head of the House Intelligence Committee Adam Schiff called the entire summit a "spectacular failure" and said Trump made things worse with his comments about Otto Warmbier.

"This the result of a president who is not prepared for these kind of negotiations, a staff that is not well-prepared and that is essentially flying by the seat of its pants," Schiff said on Face the Nation.

Ken Bredemeier contributed to this report.