The campaign was designed to crack large-scale, transnational drug-trafficking cases, destroy cross-border drug-trafficking networks and manufacturing bases, and capture drug producers and traffickers, China's Ministry of Public Security said.
Police teams would aim to track the sources of precursor chemicals, cut the main manufacturing chains and "further curb drug sources in the Golden Triangle area," the ministry reported on its wesbite.
Officials from the four nations agreed at a meeting in Beijing that the two-month drive would start on April 20, it said.
They pledged to create a "safe shipping route" along the river at Thursday's ceremony to launch the campaign.//DPA