BUJUMBURA, April 3 (Reuters) - Burundian President Pierre Nkurunziza on Tuesday said his government would not meet new demands from the country's last rebel group, accusing them of failing to keep a ceasefire deal.

The Hutu Forces for National Liberation (FNL) signed a peace agreement with the government in September after a South African-led mediation.

But the FNL last week stopped participating in a ceasefire monitoring team, arguing that government forces had not been withdrawn from areas under their control.

And recently they also said they wanted new talks on their integration into the country's institutions, and on what posts they can expect to be given when assimilated into the defence and security forces.

"The FNL is changing its mind all the time. We can't offer it things which are not included in the constitution and in the ceasefire agreement," Nkurunziza told reporters after meeting with the special envoy of the South African mediator.

"There is a place for them in the army and police, in diplomacy and in state companies, but in any case they cannot claim to join the government or other elected institutions like the national assembly," he added.

The mediator's envoy, Kingsley Mamabolo, said he came to see how both parties can move forward in implementing the truce, but added that the facilitation team and donors won't accept endless talks.

"Our mandate is to come and implement the ceasefire, but we don't think the people of Burundi will be negotiating forever and ever," said Mamabolo.

"The patience of the international community ... cannot be endless. They are also going to begin to get tired of Burundian people who cannot resolve their problems."

The FNL was not available for comment.

The ceasefire monitoring team, which grouped government officials and FNL members, began work in February, stirring hopes of lasting peace in the tiny central African country after years of civil war that killed 300,000 people.

The FNL's persistent insurgency was seen as a final barrier to stability in the coffee-growing nation of 7 million.

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