US President Barack Obama has landed in Hangzhou for the G20 Summit slated for Sunday and Monday. It will be his last visit to China before he steps down as the President of the United States.

Upon arrival on Saturday in China as part of his last visit to Asia as US Commander in Chief for the periodic photo-op that is the G-20 meeting, something unexpected happened: a very undiplomatic greeting when an unusual tarmac altercation involving Chinese and U.S. officials, including national security adviser Susan Rice, devolved into a shouting match by a member of the Chinese delegation.

It all started with the actual landing: as AP reports, the first sign of trouble is that there was no staircase for Obama to exit the plane and descend on the red carpet. So, as the photo below shows, Obama used an alternative exit. Needless to say, a diplomatic fuck up such as this one, was not accidental – Beijing was sending a loud and clear message.Then, around the time Obama was exiting through the emergency staircase, a Chinese official began shouting at White House staff after the traveling American press contingent was brought onto the tarmac. The Chinese official also attempted to block Rice and Deputy National Security Adviser Ben Rhodes after they lifted a blue rope holding back press and walked to the other side of it, closer to Obama.