Prevention made in China

The best place to gauge the extent of China's growing role in Angola is at the Quatro de Fevereiro airport in the capital, Luanda, where crowds of Chinese wait their turn to have their passports stamped.

One immigration official complained to anyone who cared to listen: "These Chinese come to Angola and can't even understand what they're being asked."

The arriving passengers may not speak Portuguese, Angola's national language, but they have good reason to be in the country: China has been one of the main financiers of oil-rich Angola's rapid development since three decades of civil war ended in 2002.

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