WASHINGTON (Kyodo) The United States should continue to provide nuclear deterrence for its allies because failing to do so would lead some of them to build their own nuclear arsenals, according to a U.S. think tank.

"U.S. allies, including members of the NATO alliance, Australia, Japan and South Korea, depend on security assurances from the United States," the Council on Foreign Relations said in a report released Tuesday.

"A component of these assurances is protection against nuclear attack," it said. "Without the nuclear aspect of these assurances, some U.S. allies may decide in the future to acquire nuclear weapons."