Narco-guerrillas and ruthless foreign gangs in the lawless, remote jungles of Myanmar are cranking out high-purity crystal methamphetamine at unprecedented levels, which top drug experts say is appearing on New Zealand streets.

Safely nestled in mountainous, dense forests, with the Myanmar authorities and army turning a blind eye, and often aided by state-backed militias, high-tech meth laboratories and factories employing world-class chemists are fuelling a US$40 billion regional drug economy.

Record billion-dollar busts in Australia, Malaysia, Indonesia and Thailand in recent months – with tonnes bound for wider distribution by organised crime supply networks – has the United Nations ramping