Turkish President Recep Tayyip Erdogan on Friday questioned the viability of a ceasefire signed between Libya’s two rival factions, one of whom is supported by Ankara.

“Today’s ceasefire agreement was actually not made at the highest level, it was at a lower level. Time will tell whether it will last,” Erdogan, who backs the Government of National Accord (GNA), told reporters in Istanbul.

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“So it seems to me that it lacks credibility,” Erdogan said, but added he hoped the ceasefire would work.

Stephanie Williams, the United Nations Libya envoy, announced earlier on Friday that the two Libyan delegations “signed a complete, countrywide and permanent ceasefire agreement with immediate effect.”

The announcement came after five days of talks at the UN.

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Turkey has provided military support to the GNA against military Khalifa Haftar, who is supported by Egypt, the United Arab Emirates and Russia.

Ankara last year signed security and maritime deals with the GNA after which it sent drones that helped turn the tide in the increasingly complex war.

Libya has been mired in chaos since the overthrow and killing of dictator Moammar Qadhafi in 2011 in a NATO-backed uprising.