(Adds quotes and details) NAIROBI, June 25 (Reuters) - Southern African leaders will hold a top-level meeting in Swaziland's capital Mbabane on Wednesday to discuss Zimbabwe, Tanzanian officials said. The meeting has been called by the leading regional body, the Southern African Development Community (SADC), amid mounting international pressure on Zimbabwean President Robert Mugabe to resolve his country's political turmoil and economic meltdown. The leaders of Tanzania, Angola and Swaziland would attend the meeting in their capacity as the SADC's troika organ on politics, defence and security, said a Tanzanian government statement received by Reuters in Nairobi. "Others who have been invited to attend the meeting are the current SADC chairman, Levy Mwanawasa of Zambia, and the SADC mediator for Zimbabwe, Thabo Mbeki of South Africa," said the statement. "The meeting will discuss how the SADC and its troika organ on politics, defence and security can help Zimbabwe to get out of its current state of conflict as it prepares for its election run-off, slated for Friday." Zimbabwean opposition leader Morgan Tsvangirai urged the United Nations on Wednesday to isolate Mugabe and said a peacekeeping force was needed in Zimbabwe. Mugabe has shrugged off Monday's unprecedented and unanimous decision by the U.N. Security Council to condemn violence against the opposition and declare that a free and fair presidential election on Friday was impossible. Tsvangirai, who has withdrawn from the election and taken refuge in the Dutch embassy in Harare since Sunday, said Zimbabwe would "break" if the world did not come to its aid. (Reporting by George Obulutsa in Nairobi, editing by Ralph Gowling)
Zimbabwe's President Robert Mugabe greets supporters of his ruling ZANU PF in Banket, 93 km (58 miles) west of the capital Harare, June 24, 2008. Mugabe defied mounting pressure on Tuesday ...