HANGZHOU, China (AP) -- If President Barack Obama was hoping for a graceful start to his final trip to Asia as commander in chief, this wasn't it.
U.S. President Barack Obama arrives on Air Force One at Hangzhou Xiaoshan International Airport in Hangzhou in eastern China's Zhejiang province, Saturday, Sept. 3, 2016. President Obama hopes to highlight his administration's ongoing commitment to the G20 as the premier forum for international economic cooperation as well as the U.S. rebalance to Asia and the Pacific. (AP Photo/Carolyn Kaster)
A confrontation between a White House aide and a Chinese official, and other diplomatic dust-ups were out in the open from the moment Air Force One landed in Hangzhou, site of an economic summit.
The first sign of trouble: There was no staircase for Obama to exit the plane and descend on the red carpet. Obama used an alternative exit.
On the tarmac, a quarrel broke out between a presidential aide and a Chinese official who demanded the journalists traveling with Obama be prohibited from getting anywhere near him. It was a breach of the tradition observed whenever the American president arrives in a foreign place.
When the White House official insisted the U.S. would set the rules for its own leader, her Chinese counterpart shot back.
"This is our country! This is our airport!" the Chinese official yelled.
Chinese President Xi Jinping (R) shakes hands with US President Barack Obama and UN Secretary General Ban Ki-moon during a joint ratification of the Paris climate change agreement at the West lake State Guest House in Hangzhou, China, 03 September 2016. The G20 Summit will be held in Hangzhou on 04 to 05 September. (AP Images)
Also, a Chinese official tried to keep Obama's national security adviser, Susan Rice, away from her boss.
Rice seemed less than amused by the incident when asked about it by a reporter.
"They did things that weren't anticipated," she said.
Later, two Chinese officials - one working to assist the American delegation - had to be physically separated after trying to hit each other outside an event.