Osaka: The G20 summit in Japan was already expected to be high on intensity and drama.

And that was before a cocaine bust barrelled toward the gathering.

Brazilian President Jair Bolsonaro has promised an "immediate investigation and severe punishment for the person responsible" for attempting to bring 39 kilograms of cocaine on one of his government's planes headed to Osaka for the summit. There appears to be little precedent for such a drug bust on a government jet ahead of one of these summits.

The drugs were discovered when one of Brazil's planes was refuelling in Sevilla, Spain, on the way to Japan. News reports said the person busted with the drugs in his luggage was a Brazilian Air Force (FAB) officer.