By C. Bryson Hull and Duncan Miriri
Riots and ethnic attacks have killed more than 1,000 people and uprooted 300,000 more since the December 27 polls, shattering Kenya's image as a stable business, tourism and transport hub.
Former U.N. chief Kofi Annan is leading the attempts to bring the country's feuding parties together. He said on Friday that the talks could not afford to fail -- and Kilonzo agreed.
"We'll not allow that so I am 1,000 percent confident we are going to bring the country a solution to the present situation."
Foreign ministers from the regional IGAD bloc threw their weight behind Annan on Friday, rejecting opposition charges they were visiting Kenya to launch separate talks to undermine him.
IGAD member nations have had bad experiences on the receiving end of multiple peace initiatives, he said, referring to Somalia, Sudan and the Ethiopia-Eritrea border conflict.
Kenya holds IGAD's rotating chairmanship and has built up goodwill in the bloc for its regional peace efforts.
To assess the situation, the U.N. Under-Secretary-General for Humanitarian Affairs and Emergency Relief Coordinator, John Holmes, flew into the country on Friday for a three-day trip.
Both sides have accused each other of rigging the December vote -- allegations that triggered unrest laying bare deep divisions over land, wealth and power that date from colonial rule and have since been stoked by politicians.
"I'm not ready to give up now ... We cannot afford to fail, he said, noting signs of compromise on both sides.
(For special coverage from Reuters on Kenya's crisis see: http://africa.reuters.com/elections/kenya/)
(Writing by Daniel Wallis; Editing by Andrew Cawthorne)