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The Latest: US to urge UN to increase pressure on NKorea

  • In this Wednesday, April 26, 2017 photo released by the U.S. Navy, the aircraft carrier USS Carl Vinson, center, leads the U.S. Navy guided-missile cruiser USS Lake Champlain, right front, and the Arleigh Burke-class guided-missile destroyer USS Michael Murphy with the Japan Maritime Self-Defense Force Atago-class guided-missile destroyer JS Ashigara, left front, and the JMSDF Murasame-class destroyer JS Samidare during a transit of the Philippine Sea toward the Korean Peninsula for an exercise with South Korea. (Mass Communication Specialist 2nd Class Sean M. Castellano/U.S. Navy via AP)

    In this Wednesday, April 26, 2017 photo released by the U.S. Navy, the aircraft carrier USS Carl Vinson, center, leads the U.S. Navy guided-missile cruiser USS Lake Champlain, right front, and the Arleigh Burke-class guided-missile destroyer USS Michael Murphy with the Japan Maritime Self-Defense Force Atago-class guided-missile destroyer JS Ashigara, left front, and the JMSDF Murasame-class destroyer JS Samidare during a transit of the Philippine Sea toward the Korean Peninsula for an exercise with South Korea. (Mass Communication Specialist 2nd Class Sean M. Castellano/U.S. Navy via AP)  (The Associated Press)

  • China's Foreign Minister Wang Yi delivers his remarks outside the Security Council at United Nations headquarters, Friday, April 28, 2017. (AP Photo/Richard Drew)

    China's Foreign Minister Wang Yi delivers his remarks outside the Security Council at United Nations headquarters, Friday, April 28, 2017. (AP Photo/Richard Drew)  (The Associated Press)

  • China's Foreign Minister Wang Yi delivers his remarks outside the Security Council at United Nations headquarters, Friday, April 28, 2017. (AP Photo/Richard Drew)

    China's Foreign Minister Wang Yi delivers his remarks outside the Security Council at United Nations headquarters, Friday, April 28, 2017. (AP Photo/Richard Drew)  (The Associated Press)

The Latest on U.S. efforts to curb North Korea's nuclear program (all times local):

7:35 a.m.

The U.S. will urge the U.N. Security Council to increase economic pressure on North Korea over its nuclear weapons program and to lean on China to turn the screws on its wayward ally.

U.S. Secretary of State Rex Tillerson is meeting with allies Japan and South Korea before chairing a ministerial meeting of the U.N.'s top decision-making body. The U.S. wants to tighten the implementation of sanctions and build international resolve to isolate North Korea so Pyongyang eventually disarms.

That's a goal that has eluded U.S. administrations for two decades, and the threat is intensifying. North Korea may already be able to strike its U.S.-allied neighbors with a nuclear-tipped missile, and could have the U.S. mainland within range by the end of President Donald Trump's first term.

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4:12 a.m.

China's foreign ministry has refused to confirm or deny U.S. Secretary of State Rex Tillerson's assertion that Beijing has threatened to impose unilateral sanctions on North Korea if it conducts further nuclear tests.

Ministry spokesman Geng Shuang repeatedly avoided giving a direct answer when asked about the matter at a daily press briefing.

Tillerson said China told the U.S. it had informed North Korea China would respond to a test by "taking sanctions actions on their own."

China wants North Korea to end its nuclear weapons program, but has opposed unilateral sanctions imposed without a U.N. mandate.

Beijing has come under growing U.S. pressure to use its leverage as North Korea's largest trading partner and main source of food and fuel aid to compel Pyongyang to heed U.N. resolutions.