The resurgence of the militia Taliban in Afghanistan and Pakistan joined the growing security problems in Iraq, are two key factors that drive away the possibility of an American attack on Iran. At this stage it must be added that the Islamic Republic is becoming less isolated from the regional and international political and economic context. Much has written in the past four years about the imminence of an invasion or an air attack on Tehran, supported by Washington and London, due to the huge differences that remain since the revolution of 1979. However, many analysts attributed the delay in the war plan to Iran, oil-rich country, could stop pumping crude to the West and block the departure of vessels of other States of the Persian Gulf which export hydrocarbons, which could cause a severe global economic crisis. This observation is not quite complete, since Tehran economy depends heavily on purchases of fuel by powers.
The main factor that prevents an attack on Iran is that the regime of Iran is not just as you think. Relationship with Russia Moscow is one of the main allies of Tehran regardless to the ideological line of the Government. It was with the moderate Mohamed Jatami and is with conservative Mahmud Ahmadinejad. Russia not only all resolutions against Iran in the UN Security Council vetoes, but is a direct investor of the Iranian nuclear program. Furthermore, takes advantage of the large sale of weapons, including missiles S-300 to defend nuclear installations.
In addition, Russia uses for their benefit the situation of confrontation of United States with Tehran, Iranian regional influence is a brake on the dreaded expansion of NATO in Eurasia. Relationship with the rapid industrial expansion of Beijing China demand increasingly more quantity of hydrocarbons, that China does not possess and which must import most of Iran. At the same time, Tehran together with Pakistan are the two main buyers of Chinese weapons.