Zimbabwe’s president, Robert Mugabe, and its prime minister in waiting, Morgan Tsvangirai, have not agreed on much since they signed a deal four months ago to run the government together. But on Sunday they seemed to find common ground on at least one thing: their power-sharing deal will either come to fruition this week or collapse. [...] The consequences of the country’s political turmoil — and the absence of an undisputed government since March — have turned the country into a humanitarian disaster zone. A cholera epidemic brought on by the collapse of water, sanitation and health services still rages. More than 43,000 cases have been reported since August and almost 2,300 people have died. About half the population is now hungry and dependent on international food aid.