opswarfare came across this news story by chance while looking for another article. Tactical details of the "so-called" joint patrols are not known.
It is not yet clear how they will link up with their Burmese, Lao and Thai counterparts, how far along the Mekong the patrols will go, or if officers from one country will be able to perform arrests in others' territorial waters.
If the details are ironed out, it may point the way towards a similar arrangement for the disputed Spratly islands.