HANGZHOU, China — If President Barack Obama was hoping for a graceful start to his final trip to Asia as commander in chief, this wasn’t it.

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 onto 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 US 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.

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.