Leaders from Russia and Japan met in Moscow in an attempt to ease tensions between the two nations. After spending almost two years in a Russian prison, Ukrainian pilot Nadiya Savchenko was released from prison in a prisoner exchange. Russia said that eight of their Olympic athletes failed the doping retests during the 2012 London Olympics. Russia and the United States (US) reached a deal to extend the ceasefire in the besieged Syrian city of Aleppo. Russia believes that the North Atlantic Treaty Organisation's (NATO) new anti-missile site in Romania is a threat to their national security. Russian-owned oil company Rosneft and Greece’s Hellenic Petroleum planned to sign an agreement on the supply of oil and oil products to Greece. In an attempt to circumvent the Organisation of the Petroleum Exporting Countries' (OPEC) price setting, President Vladimir Putin stated that Russia plans to open cooperation with Indonesia. Hoping to right the ship that is the Russian economy, President Vladmir Putin appointed former finance minister Alexei Kurdin to a senior economic advisory role. According to the President of the European Bank for Reconstruction and Development, Suma Chakrabarti, Russia’s economy may return to growth by the end of 2017.