Russia is generally considered a great power and is a regional power, possessing the largest stockpile of nuclear weapons and having the third-highest military expenditure in the world. It has a high-income economy, which is the eleventh-largest in the world by nominal GDP and fourth-largest by PPP, relying on its vast mineral and energy resources; which rank as the second-largest in the world for oil and natural gas production. However, Russia ranks very low in international measurements of democracy, human rights and freedom of the press, and also has high levels of perceived corruption. It is a permanent member of the United Nations Security Council; a member state of the G20, SCO, BRICS, APEC, OSCE, and WTO; and the leading member state of post-Soviet organisations such as CIS, CSTO, and EAEU. Russia is home to 32 UNESCO World Heritage Sites.