Negotiators from Russia, Ukraine and the United States are scheduled to begin two days of talks in Abu Dhabi on Tuesday, with security guarantees expected to be a central issue and no agreement yet in sight.

The meeting will be the first round involving all three countries since February, according to the Associated Press. Earlier negotiations this year produced no visible progress towards ending the war. Fighting and long-range strikes have continued as diplomatic contacts resume.

Ukraine has rejected Russian demands that it surrender territory Moscow has not captured and accept limits on its military and partnerships with Western countries. Kyiv says those partnerships and security guarantees are essential to deter another invasion. President Volodymyr Zelenskyy has called for clear answers about what allies would do, and when, if Russia attacks again.

The talks also expose a disagreement about who should shape a settlement. Ukraine’s chief negotiator Rustem Umerov said his delegation would meet European envoys separately in Abu Dhabi. The Kremlin has said European governments would need to be involved in broader negotiations, but only at a later stage.

The two-day meeting is scheduled, not a confirmed breakthrough. Its outcome will depend on whether the parties can narrow fundamental differences over territory, a ceasefire and the security arrangements that would follow any agreement.