Turkish President Tayyip Erdogan earlier on Friday said Turkey will set up a dozen observation posts across northeast Syria, insisting that a planned “safe zone” will extend much further than U.S. officials said was covered under a fragile ceasefire deal.

The truce, announced by U.S. Vice President Mike Pence after talks in Ankara with Erdogan, sets out a five-day pause to let the Kurdish-led SDF militia pull out of the Turkish “safe zone.”