The International Crisis Group (ICG) has warned that Iraq could turn into the main battlefield of confrontation between the United States and Iran. Iraq could bear the brunt if conflict intensifies between Tehran and Washington, the think-tank said in a study released Wednesday. ICG, which researches ways to prevent war, interviewed officials around the world including from Iran for an extensive report on the state of the 2015 denuclearization accord between Tehran and major powers. The ICG said Iran would likely continue to comply with the deal, seeing itself as holding the moral high ground and capable of waiting out US President Donald Trump, who faces a re-election battle next year. Trump has withdrawn the United States and ramped up economic pressure aimed at isolating Iran. The study said that Tehrans calculations could change if its oil exports, which stood at 3.8 million barrels a day in 2017, fall below 700,000, a level that could trigger hyper-inflation and intensify domestic protests which for now appear manageable. If Iran decides to retaliate against the United States, the report said that Tehran may find its most attractive option to be to employ its proxies around the Middle East, a path that would be murky enough to avoid a strong European reaction. The report quoted a senior Iranian national security official as saying that the likeliest theater was Iraq, where militias from the Shiite majority have close ties with Tehran.  "Iraq is where we have experience, plausible deniability and the requisite capability to hit the US below the threshold that would prompt a direct retaliation," the official was quoted as saying, according to Agence France Presse. Iran is also deeply involved in Syria and Lebanon, but the two countries are especially fragile and Tehran could lose its gains, the official said. Iran has limited assets in Afghanistan, while stepping up support for Houthi rebels in Yemen would hurt Saudi Arabia more than the United States, the official said. The Wall Street Journal reported Sunday that Trumps hawkish national security advisor, John Bolton, asked for military options to strike Iran after an Iranian-linked group launched a mortar attack in September on Baghdads "Green Zone," the protected area where the US embassy is located. The US says its embassy was the target. No one was hurt and demonstrators also ransacked the Iranian consulate in Basra during the wave of protests over economic conditions in Iraq.