China's top diplomat, who recently met a senior adviser to U.S. President-elect Donald Trump, is a high-flying former Chinese ambassador to Washington with a deep understanding of U.S. politics, a country he has clashed with, too.

State Councillor Yang Jiechi, who outranks China's foreign minister, met Trump advisers, including his pick for national security adviser, retired U.S. Army Lt. Gen. Michael Flynn, during a transit in New York on his way to Latin America in recent days, a Foreign Ministry spokesman said Monday.

The spokesman gave few other details, other than that they exchanged views on China-U.S. ties and other important issues.