In January 2011, BP and Russia's state oil company, Rosneft, formed a strategic partnership on Arctic development. In March 2011 the Stockholm International Arbitration court blocked the BP-Rosneft deal as breaching TNK–BP earlier contractual arrangements. BP had previously signed a shareholding agreement with AAR, which stipulated that TNK–BP would be the primary corporate vehicle for BP's oil and gas operations in Russia. AAR's legal action and minority shareholder's claims led to the collapse of the BP-Rosneft deal in August 2011, when BP was replaced with ExxonMobil as Rosneft's strategic foreign partner in the Arctic.