Vietnam, fresh from its first major heroin trafficking scandal, is set to move into the international fold in the battle for global drug control. A Foreign Ministry spokesman confirmed Hanoi would soon sign three key United Nations conventions on drug control - including a sweeping 1988 document strenghtening investigative and extradition powers. The United Nations has been nudging Vietnam towards the conventions, fearing the country's open door policies have exposed its borders and vast police force to international syndicates for the first time. Evidence is growing of heroin moving out of the Golden Triangle through northern Vietnam and into China and beyond. 'Increasingly, there will be a need for Vietnam to be part of the international system,' said Jorn Kristensen, Vietnam chief of the UN Drug Control Programme. The 1988 document lays ground-work for international co-operation to trace ill-gotten gains through banking systems while setting standards for 'controlled deliveries', where police track a shipment across borders to its destination. Both Thailand and Burma have joined the convention, a move which has meant greater co-operation between the two states seen as being at the heart of the global heroin scourge. The UN is developing training for Vietnamese police - among the lowest paid in the region - to tighten investigative procedures.