Timeline of the prelude to the Russian invasion of Ukraine

This timeline of the prelude to the 2022 Russian invasion of Ukraine covers a period of heightened tensions between Russia and Ukraine from early 2021 until the start of the Russian invasion of Ukraine on 24 February 2022. == 2021 == 2 September – Russia refuses to extend the mandate of the Organization for Security and Co-operation in Europe mission at the Gukovo and Donetsk border checkpoints from 30 September onward.

Source: Wikipedia — Timeline of the prelude to the Russian invasion of Ukraine (CC BY-SA 4.0)