When Jyrki Katainen stepped down as Prime Minister and Chairman of the National Coalition Party, Stubb was elected as party chairman in June 2014 over his two rivals, Paula Risikko and Jan Vapaavuori. He formed a five party government coalition, and was officially appointed Prime Minister by President Niinistö on 24 June. One of the challenges the new Prime Minister faced is the relationship between Finland and neighboring Russia. This has always been a difficult issue for Finland, as it affects Finland's willingness to become a NATO member. The recent crisis in Ukraine as well as the dispute over free trade between Russia and Finland has made the issue thornier.