The militant has became the most richest militant organization of the world and it has gained access to many oil fields in Iraq and Syria.
ISIS doesn't depend on foreign aid to survive. In Syria, they've built up something like a mini-state: collecting the equivalent of taxes, selling electricity, and exporting oil to fund its militant activities.
The United Nations has warned that foreign jihadists are swarming into the twin conflicts in Iraq and Syria on “an unprecedented scale” and from countries that had not previously contributed combatants to global terrorism.
A report by the UN says that 15,000 people have travelled to Syria and Iraq to fight alongside the Islamic State (Isis) and similar extremist groups. They come from more than 80 countries, the report states, “including a tail of countries that have not previously faced challenges relating to al-Qaida”.
