US President Joe Biden and Chinese President Xi Jinping are set to meet in San Francisco for the second time in three years to address tensions, following a six-month US push to engage its geopolitical rival.

The summit, which is part of the APEC group, is expected to focus on improving relations with China, such as increased commercial flights and cooperation on thornier issues.

While no major breakthroughs are expected, US officials believe that restoring functioning interaction between the two militaries may take time.