Biden to emphasize Asia pivot on tour

Visits to Beijing, Tokyo and Seoul part of effort to demonstrate interest in region, say experts

As US Vice-President Joseph Biden prepares for his East Asian trip amid a bitter row between Beijing and Tokyo, the issue of how the United States and China, the world's two largest economies, handle their relationship has again moved to the front burner.

The White House announced on Monday that Biden will visit Japan, China and South Korea in the first week of December.