Trilateral Contact Group on Ukraine

The Trilateral Contact Group on Ukraine (also known as the Trilateral Contact Group for the peaceful settlement of the situation in eastern Ukraine) was a group of representatives from Ukraine, the Russian Federation, and the Organization for Security and Co-operation in Europe (OSCE) that was formed as means to facilitate a diplomatic resolution to the war in the Donbas region of Ukraine. There were several subgroups.

Source: Wikipedia — Trilateral Contact Group on Ukraine (CC BY-SA 4.0)