China has amassed more than 60,000 troops along the Line of Actual Control with India, US Secretary of State Mike Pompeo has said as he hit out at Beijing for its "bad behaviour" and the threats it poses to the Quad countries.

The Foreign Ministers from the Indo-Pacific nations known as the Quad group - the US, Japan, India and Australia - met in Tokyo on Tuesday in what was their first in-person talks since the coronavirus pandemic began.