American military invasion of Iraq and its impact on the national security of the Islamic Republic of Iran

America's invasion and occupation of Iraq in March 2003 that led to the fall of the Baathist regime was the beginning of a new era in relations between Iran and Iraq. The collapse of Saddam's regime, created a unique opportunity for the Islamic Republic to expand political and cultural power in Iraq. Although this occupation weaken Iraq and the elimination of direct threats of serious national security of the Islamic Republic of Iran, but the continued presence of trans-regional powers, internal instability in Iraq, the uncertain future of northern Iraq and increasing regional role of Turkey, Saudi Arabia, Qatar and other countries. region and more important than all this continued bumpy device foreign policy we compared to other regional competitors, threats to the national security of the Islamic Republic of Iran increased so as to increase the role of regional, Saudi Arabia, Turkey and Israel the recent military alliance between the two countries, Israel has allowed itself in terms of geography Close to Iran and the presence in northern Iraq to counter Iran closer to your goals. In this paper, factors and elements affecting national security after the occupation of Iraq has been analyzed.