U.S. national security adviser Jake Sullivan has raised concerns with China's top diplomat Yang Jiechi over Beijing's veto at the United Nations of a U.S.-led push to impose more sanctions on North Korea, a senior U.S. official said.
Washington has warned that North Korea's first nuclear test since 2017 could happen at "any time." China says it does not want to see that happen, which is partly why in May it vetoed a bid to impose new U.N. sanctions on Pyongyang over renewed ballistic missiles launches.
