The Russian military said Tuesday that it had “drastically” reduced its military activity near the Ukraine capital of Kyiv and the northern city of Chernihiv as talks with Ukraine aimed at ending the war entered the “practical” stage.

Russia and Ukraine held face-to-face talks Tuesday in Turkey as the United Nations pressed for a cease-fire for Russia’s brutal invasion. The talks took place in the Turkish presidential office in Istanbul and lasted more than three hours, Russia’s Tass reported.

Alexander Fomin, Russia’s deputy minister of defense, said the military cutbacks were made to “increase mutual trust and create conditions for further negotiations.”

Ukraine’s military said it had detected withdrawals around the cities, and U.S. Gen. Tod Wolters, commander of the U.S. European Command, said that is “exactly what we see.” The Russian advance on Kyiv had stalled in recent weeks, but missile strikes have battered the city and left shortages of food, water and other necessities for a population of almost 3 million people.

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The head of the Ukrainian delegation, David Arahamiya, said his side presented an official proposal for a new system of security guarantees. The proposed security pledge will not apply to the parts of Ukraine whose status remains in dispute – Crimea, which Russia considers its territory, and the breakaway Donetsk and Lugansk People’s Republics

“We insist that it be an international treaty signed by all security guarantors who ratify,” he said. “We want it to be an international mechanism of concrete security guarantees for Ukraine.”

Lead Russian negotiator Vladimir Medinsky said Ukraine pledged not to join any military alliance and not to host foreign military bases or foreign troops. Even military exercises would require prior approval from guarantors, according to the proposal.