Due to the ongoing situation between Russia and Ukraine, Roman Abramovich announced on Wednesday, March 3rd, that he was going to sell Chelsea.This marks the end of an era that started in 2003 when the Russian billionaire bought the club for £150 million. Roman Abramovich's buying of Chelsea propelled the club into Europe's elite, as he went after the highest quality players and managers for the club, regardless of cost.Roman Abramovich enjoyed a trophy-laden spell as owner of ChelseaDespite his tendency to fire managers whenever he felt like it, winning trophies became second nature to Chelsea under Roman Abramovich. The club won 21 major titles with him as its owner, including every single competition they took part in.The Russian businessman was also praised for his personal interest in the team by players and staff alike. Despite the successes, Roman Abramovich made some choices in his dealings as Chelsea owner that backfired. Here is a list of five such mistakes made by the Russian oligarch.#5 Appointment of Andre Villas-BoasWolverhampton Wanderers v Chelsea - Premier LeagueWhen Roman Abramovich appointed Jose Mourinho as manager, the young Portuguese coach had just led FC Porto to UEFA Champions League glory. On Mourinho's coaching staff was a certain young man, Andre Villas-Boas, who would manage Chelsea less than a decade later.Villas-Boas was only 33 when he led FC Porto to a league, cup and UEFA Europa League treble in 2010-11. This prompted Abramovich to sanction a deal to bring the Portuguese manager to his club.Chelsea paid a world-record fee of €15 million to sign the young manager, but that proved to be a waste of money. Villas-Boas tried to phase out the team's senior players immediately after he was appointed, leading to unrest in the camp. After a 2-0 defeat to Everton, the players questioned his tactics in the presence of Abramovich, implying that they didn't understand his philosophy.Harry@HarryCFC170Throwback to 2011 when Chelsea appointed Andre Villas-Boas. The youngest coach to win the Europa League (33 years old) + same age as Lampard + Drogba. His downfall at CFC was trying to offload these players too soon.At first, I really thought we had the next Jose Mourinho 08:27 AM · Feb 26, 202219217Throwback to 2011 when Chelsea appointed Andre Villas-Boas. The youngest coach to win the Europa League (33 years old) + same age as Lampard + Drogba. His downfall at CFC was trying to offload these players too soon.At first, I really thought we had the next Jose Mourinho 🇵🇹🔵 https://t.co/i1bpzXoFwNVillas-Boas did not last a season before he was sacked with Chelsea on the verge of elimination from the UEFA Champions League following a defeat to Napoli. His assistant Roberto Di Matteo took over and led the club to European glory in the same year.#4 Joining the European Super LeagueFans Respond To News Of Football Super LeagueWhen Chelsea announced that they had agreed to join the break-away European Super League along with a number of top clubs, the fans felt betrayed and came out in protest. They felt that the club had chosen to not consider them in making the decision, and they hit the streets in anger.This episode made it seem like Roman Abramovich and Chelsea were only after money and had forgotten the club's major stakeholders, the fans. Within hours, the decision was reversed and the club announced that it would not be a part of the Super League.The Super League saga was the first time that Chelsea's fans felt openly betrayed by the club. The controversy almost soured their season before Thomas Tuchel led them to Champions League glory.