Crimea became a Russian region after a referendum held there in March 2014, where most residents spoke out in favour of reunification with Russia.
Ukraine is capable of ruining many empires. A great deal of the Russian empire collapse was brought by intrigues played by the empire’s ruling elites, originating in Ukraine. Dnepropetrovsk dynasty was governing the USSR. Once Ukrainian elites moved to the US’s camp, an awful conflict among American elites has emerged. Whereas we follow the Ukrainian crisis as a civil war of our close people, Americans treat Ukraine as Guatemala or any other colony and protectorate. Suddenly it turned out that Ukrainian elites can influence US domestic policies. It all started when Petro Poroshenko finished off Trump’s consultant Paul Manafort.
This is a mix of conspiracies and ungrounded historical generalizations aimed to discredit Ukraine, Ukrainian statehood, and Ukrainians. It also follows recurring pro-Kremlin narratives about Ukraine as US's colony and a puppet state, a civil war in Ukraine, and US's meddling into Ukrainian elections because of Poroshenko-Manafort story. It is a conspiracy and simplification to consider Ukraine and the persons originated on its territory as the main drivers for the downfall of Russian empire or the USSR. Historians agree that the Russian empire collapsed during the February Revolution of 1917, largely as a result of massive failures such as hunger, because of its participation in the WWI. There were many factors that led to the collapse of the USSR beyond the alleged mismanagement of the ruling Dnevpropetrovsk clan, such as political policies, economics, defense spending, and the Chernobyl nuclear disaster, etc. Mueller's 448-page report though mentions Ukraine a dozen of times, mostly in a part which assesses Paul Manafort's ties to Russia and Ukraine, and does not contain a single mention of Petro Poroshenko. See earlier disinformation cases alleging that one of two main reasons behind Poroshenko's loss in presidential elections was the arrest of Trump’s lawyer Paul Manafort, that the US introduced anti-Russian sanctions in exchange for anti-Trump kompromat by Poroshenko team, and that Ukrainian elections are a competition among Washington’s puppets.