HARARE, Oct 12 (Reuters) - Zimbabwe's opposition MDC leader Morgan Tsvangirai warned on Sunday that if new mediation efforts to break a deadlock on cabinet talks fail, his party would be forced to walk away from a power-sharing deal.

"If this mediation fails we will say 'this marriage has failed to be consummated, and we can not force things'. There will be no option but to go our separate ways," he said at a rally. Former South African President Thabo Mbeki was expected in Harare on Monday to break an impasse over the appointment of cabinet posts, days after Zimbabwe President Robert Mugabe allocated three important ministries to his ZANU-PF party, threatening a power-sharing deal. (Reporting by MacDonald Dzirutwe; Editing by Matthew Jones)

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