At the APEC Economic Summit three years ago, President Obama was at one end and standing with the wives of the leaders. Apparently, the men weren't worried that the O-man would make a move on them, and the Lightbringer wasn't concerned about the obvious disrespect.
This year, Putin and Trump are right there in front, next to the Vietnamese hosts.
The Asians are big on protocol and "face," and this positioning difference is no accident.
As with the Chinese, much more respect for Trump in Vietnam.