Russia and Ukraine’s top diplomats on Saturday used a high-level conference in Turkey to once again trade accusations of violating a tentative U.S.-brokered deal to pause strikes on energy infrastructure, underscoring the challenges of negotiating an end to the 3-year-old war.

The two foreign ministers spoke at separate events at the annual Antalya Diplomacy Forum, a day after U.S. envoy Steve Witkoff met with with Russian President Vladimir Putin to discuss peace prospects.

While Moscow and Kyiv both agreed in principle last month to implement a limited, 30-day ceasefire, they issued conflicting statements soon after their separate talks with U.S. officials in Saudi Arabia.

They differed on the start time of halting strikes, and alleged near-immediate breaches by the other side.

“The Ukrainians have been attacking us from the very beginning, every passing day,” Russian Foreign Minister Sergei Lavrov said.

— The Associated Press