The fighting between Thailand and Cambodia exposes the depth of global arms proliferation in South-East Asia, proving more sophisticated and deadly than experts expected.

First came a push from the Malaysian premier, then China reached out, but it was only after President Donald Trump called Thailand's leader last week that Bangkok agreed to talks with Cambodia to end an escalating military conflict.

A threat by President Donald Trump to halt trade negotiations with both Cambodia and Thailand until a truce had been reached forced both sides to the negotiating table. Even so, the ceasefire looks shaky.