Zimbabwe has faced daily 12-hour power cuts due to a drought affecting power supply at the Kariba Dam.
Prince Johnson oversaw the torture and killing of the then-president but was later elected to the senate.
At least 13 bodies have been found but officials fear the true number of dead is much higher.
The UK foreign secretary dismisses criticism of the agreement as "politicking" before elections.
A shadowy operative appears to overstep his mark in the battle for Russian influence in Africa.
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