U.S. President Barack Obama and Chinese Premier Li Keqiang agreed on Monday to step up cooperation in the United Nations Security Council and in law-enforcement channels after North Korea's fifth nuclear test, the White House said.
U.N. diplomats say China and the United States have started discussions on a possible U.N. sanctions resolution in response to the test earlier this month, but Beijing has not said directly whether it will support tougher steps against North Korea.
Obama met Li on the sidelines of the annual United Nations General Assembly session in New York.
"Both leaders condemned North Korea's September 9 nuclear test and resolved to strengthen coordination in achieving the denuclearization of the Korean Peninsula, including by invigorating cooperation in the United Nations Security Council and in law enforcement channels on North Korea," a White House statement said.
China is isolated North Korea's most important diplomatic backer and its biggest trading partner.