WASHINGTON — With China's backing, U.S. diplomats unveiled what they described as a plan for the toughest international sanctions in two decades against North Korea in response to its recent nuclear and ballistic missile tests.

The sanctions are part of a resolution submitted Thursday to the U.N. Security Council. Without a Chinese veto, the resolution is all but certain to pass in coming days.

Under the resolution, North Korea could not import aviation fuel, and limits would be placed on its exports of coal, iron, gold and titanium, U.S. Ambassador to the U.N. Samantha Power said at a press conference.

The resolution also would impose inspections of all cargo going in or out of North Korea, tighten restrictions on North Korean banking, ban acquisition of dual-use nuclear material and blacklist additional individuals and companies.

Power said the resolution would impose the "strongest set of sanctions in more than two decades" and would "break new ground."

The sanctions will "deliver an unambiguous message (that) the world will not accept your actions (and) we will work relentlessly and collectively to stop your nuclear program," Power said.

At a minimum, the sanctions are likely to increase tension in the region.

China's support for the crackdown was the biggest surprise. It came as Chinese Foreign Minister Wang Yi wound up intense negotiations in Washington with Secretary of State John Kerry and other Obama administration officials.

Speaking Thursday to a Washington think tank, Wang said the resolution would "limit the development of nuclear missile technologies" by North Korea.

Wang told the nonpartisan Center for Strategic and International Studies that China and the United States agreed to attempt to avoid sanctions that harm the North Korean people.

He said the goal was "to uphold the international nuclear nonproliferation regime."

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