Pyongyang has been threatening to strike back if the drill goes ahead.
BBC: US envoy Bill Richardson warns of Korea tinderbox
The companies are in the process of preparing to drill again in the Gulf in the days ahead.
FORBES: Connect
PDVSA's oil-production technology is now at least five years ahead of Pemex's, particularly in its ability to drill in deep waters and in its use of seismic surveys.
ECONOMIST: The oil industry
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