Many in President Mugabe's party urged the MDC to do more to get the sanctions removed.
Tendai Biti, the MDC's secretary-general, has been jailed, charged with treason and denied bail.
Police and the MDC confirmed Tendai Biti's arrest and the charges he will face.
I'm not sure that Mr Tsvangirai is the best that the MDC has to offer.
Mr Biti, an MDC man, says his treasury has received no diamond revenue at all.
The MDC is demanding fresh elections, to be organised by an independent electoral commission.
The opposition Movement for Democratic Change (MDC) again collected most seats in urban areas.
Mr Mutambara insists that there will be no deal without the main MDC group.
ECONOMIST: A negotiated end of the power struggle looks far off
MDC's leaders met this week to discuss whether to take part in a second round.
MDC's victory would be snatched away if results are reversed in just nine constituencies.
Mugabe's party has denied any part in the deaths, saying the MDC blames them frequently.
Four MDC members were arrested at the same time and have been charged with impersonating police officers.
BBC: Beatrice Mtetwa case: Zimbabwe court grants lawyer bail
Mr Mugabe's Zanu-PF party was also accused of unleashing violence against MDC supporters, an allegation it denied.
Having lost faith in Mr Mbeki, the MDC also wants a full-time mediator from the African Union.
ECONOMIST: A negotiated end of the power struggle looks far off
The MDC has lost quite a lot of support because of its patchy performance in the unity government.
Holdings, Inc. ( NYSE: MDC) is trading flat, and Standard Pacific Corp. ( NYSE: SPF) is relatively unchanged.
Moreover, it says, an MDC-led government would include some from the ruling party as well as non-party technocrats.
Tsvangirai's party called the announcement an "ambush, " and the MDC leader threatened Sunday to withdraw from the deal.
Biti, secretary general of the MDC, was arrested when he arrived in Harare, Zimbabwe, from South Africa.
Mr Tsvangirai says that the only legitimate poll was the first round, in March, which the MDC won.
Despite the troika's statement, MDC Secretary-General Tendai Biti said the disagreement extends beyond the Ministry of Home Affairs.
But the MDC leader, Morgan Tsvangirai, resisting pressure from Mr Mbeki, stood his ground and refused to participate.
ECONOMIST: A negotiated end of the power struggle looks far off
Mr Tsvangirai's spokesman Luke Tamborinyoka told the BBC that the MDC would scrap the law if it won elections.
Voters are expected to endorse the constitution, negotiated by Zanu-PF and the MDC.
BBC: Zimbabwe police 'defy' order to release Beatrice Mtetwa
Morgan Tsvangirai, the MDC president, has been touring the region trying to persuade African leaders to intervene in Zimbabwe.
In the last five years MDC has lowered its debt-to-capital ratio to less than 35% from more than 50%.
"I cannot determine their capacity to break the deadlock, " the MDC leader said.
Tsvangirai dropped out of a subsequent runoff, citing widespread violence against MDC supporters.
CNN: Carter: Cholera-, inflation-ridden Zimbabwe 'a basket case'
The MDC reported Monday that many of the nation's doctors and nurses have gone on strike because of poor salaries.
Mugabe's ZANU-PF party and Tsvangirai's MDC party have been negotiating over the distribution of cabinet posts in a unity government.
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