China and the United States will work together to try and prevent further missile tests by North Korea, US President Barack Obama says.
Mr Obama met Chinese President Xi Jinping on the sidelines of a nuclear summit in Washington on Thursday.
Mr Obama said both countries were keen to see a nuclear-free Korean peninsula. He said he and Mr Xi were seeking to agree "how we can discourage action like nuclear missile tests that escalate tensions and violate international obligations".
Mr Xi, quoted by China's state news agency Xinhua, said it was critical all parties "fully and strictly" implemented newly-agreed sanctions. China is North Korea's closest ally and largest trading partner.
