Nearly 100 foreign policy and security experts in the United States released a joint statement opposing Republican presidential candidate Donald Trump's foreign policy views that they said would "weaken America's alliances and erode its power."

One of the reasons they cited in the statement was Trump's long-running threats to "walk" from the longstanding alliances with Korea and Japan that they said "have strongly supported America's postwar Pacific presence and play a vital role in shaping China's behavior."

"We, the undersigned, do not believe ... that Mr. Trump offers a considered recalibration of America's engagement abroad," said the statement drafted by Ali Wyne, a security fellow with the Truman National Security Project.

"Having reviewed his proposals in their totality, we conclude not only that he advocates a de facto U.S. withdrawal from the liberal world order of which it has been the principal beneficiary in the postwar era, but also that he exhibits a predisposition to strategic recklessness," it said.

"On balance, Mr. Trump's foreign policy would weaken America's alliances and erode its power," it added.

The other experts included experts on Northeast Asia, such as Stephan Haggard, director of the Korea-Pacific program at the University of California San Diego; Robert A. Manning, a senior fellow at the Atlantic Council; and John Delury, a senior fellow of the Center on U.S.-China Relations.

Concern has persisted about the potential negative effects Trump could have on alliances if he is elected. The real-estate tycoon has expressed deeply negative views of alliances and U.S. security commitments overseas, seeing them as a cumbersome burden sucking up taxpayer dollars.

Trump has long argued that the U.S. should no longer be the "policeman of the world," expressing deeply negative views of U.S. security commitments overseas and claiming it makes no sense for the U.S. to help defend such wealthy allies as Japan, South Korea and Saudi Arabia in exchange for little.

He says allies should pay 100 percent of the cost of stationing American troops, or the U.S. should be prepared to end their protection. He even suggested allowing Korea and Japan to develop their own nuclear weapons for self-defense so as to reduce U.S. security burdens.

About 28,500 American troops are stationed in South Korea to deter North Korean aggression, a legacy of the 1950-53 Korean War, which ended in a truce, not a peace treaty. Many agree that the troop presence is also in line with U.S. interests in a region marked by China's rise. (Yonhap)