Yanukovych had over 100 people killed in a violent crackdown on protests, then fled to Russia as he was about to be imprisoned. On 21 February 2014, the Ukrainian parliament voted 328-0 to hold snap elections to replace Yanukovych before the end of his term. Not a single member of his own party supported him or voted against the decision. He was replaced through general elections held a few months later. This is exactly how parliamentary democracy is supposed to work.
The vote did not follow formal impeachment procedure under Article 111 of the Ukrainian Constitution (which requires a Constitutional Court review and more formal steps).
I am sure you then have no objections to the 53–0 vote in Crimea to remove the then-Ukrainian-appointed prime minister Anatoly Mogilev and install Sergei Aksyonov and the subsequent referendum on autonomy. After all, this is "exactly how parliamentary democracy is supposed to work".
Regarding the Crimean referendum, I do have objections: international law considers referendums held under foreign military occupation illegitimate, and rightfully so. Had Hitler staged a referendum in occupied Paris after the invasion, would that have meant that the French willingly joined the Third Reich?
The Crimean referendum is nothing new. In the 1940s, the USSR also staged a series of votes to legitimize their invasions of European nations. At this point, I would consider anyone expecting me to take these referendums seriously as either severely underinformed or simply maliciously trolling.