Zimbabwe's Morgan Tsvangirai has ended talks on power-sharing with President Robert Mugabe with no agreement, a spokesman for the prime minister says.
The four-hour meeting is the first time the prime minister has met with the president since pulling out of the coalition government on 16 October.
A spokesman for Mr Tsvangirai said both men were "worlds apart" on many issues.
"If they (Mugabe and his ZANU-PF) are facing west we are facing east," Chamisa said.
Zimbabwe's prime minister withdrew from a Mugabe coalition over co-operation issues and alleged human rights abuses.
The crisis hit the fragile coalition earlier this month when the MDC said it would stop attending cabinet meetings in protest against the arrest of one of its senior officials and Mugabe's refusal fully to implement a political agreement.
Mugabe and his old foe Tsvangirai entered the unity government after disputed elections left the impoverished African state in a stalemate and in danger of serious violence.
Difficulties in implementing their agreement have delayed efforts to secure billions of dollars from Western donors, money that is crucial for Zimbabwe's economic recovery.
Chamisa said the MDC would now wait for the outcome of mediation by the Southern African Development Community (SADC), and if this failed to end the deadlock the party would start to prepare for elections.
"If that (mediation) fails, unfortunately we have to start to prepare for elections because there is no government without the GPA (Global Political Agreement)," Chamisa told Reuters.
"The elections have to be managed by credible institutions."
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