ZAGROS MOUNTAINS, Iraq — About 5 kilometers from Iran, aircraft roar overhead. Are the planes American, Israeli, Iranian? The Kurdish fighter shrugged and urged haste. The final stretch to his militia’s base could be reached only on foot, along a steep path covered in loose rock. Out in the open, everyone is vulnerable. A tunnel leads to the underground base in a sliver of the Zagros Mountains in northeastern Iraq. The Iranian-Kurdish guerrilla group, the Kurdistan Free Life Party, is careful to keep its exact location secret. Visitors must switch their smartphones to flight mode before handing them over upon entry. The Kurdistan Free Life Party is in waiting mode, poised along Iran’s western border to move in if a weakened regime opens up a path to strike it. The Axel Springer Global Reporters Network, which includes POLITICO, was granted rare access to the group’s base and its members, who discussed its ideology, goals and under what conditions they’d go into Iran. Militia representative Bahar Avrin said in an interview inside the base that the organization already has elements “inside” Iran, and that deploying a larger force against Tehran is ultimately a question of the right timing and conditions. The border between northern Iraq and Iran runs through the Zagros Mountains and is considered porous — for smugglers, locals and the handful of militias operating there. The Kurdistan Free Life Party, often referred to by its Kurdish acronym PJAK, is part of a coalition of six Kurdish militia groups that want to topple Iran’s Islamist regime and usher in a government that is more democratic and grants more rights and autonomy to Iranian Kurds in Iran. President Donald Trump has said Iraqi and Iranian Kurdish groups are “willing” to participate in a ground offensive against Tehran — but he has said he ruled out the idea to avoid making the war “any more complex than it already is.” A Kurdish assault could spark a sectarian power struggle that destabilizes Iran. And key U.S. allies with their own Kurdish minorities — Iraq and Turkey — have warned the idea could spread unrest elsewhere in the Middle East. The idea could nonetheless prove tempting for Trump as the war, now in its third week, drags on. The ruling regime in Tehran has not capitulated despite punishing airstrikes that have killed scores of its top leaders. Trump could find himself looking for military options that do not trigger the political risk that would accompany deployment of U.S. ground troops. “The president never takes anything fully off the table,” said Victoria Coates, who served as deputy national security adviser for the Middle East in Trump’s first term. “And if you were considering this, this is the last thing you would want the Iranians to know.” TUNNEL VISION PJAK looks ready to go into a fight, with a base that suggests an organized military operation. It consists of a tunnel system running through the mountain’s interior, with electricity and running water. On the walls hang photographs of fallen fighters — many of them young, women and men in their 20s and 30s. Four monitors mounted to the walls display the surrounding terrain outside. Motion sensors control the cameras; when a bird flutters across the screen, the image switches to it automatically. In a dark tunnel, a 20-year-old fighter holding an assault rifle introduced herself as Zilan. Her day begins at 5:30 a.m. and follows a strict schedule. “Our daily life is based on discipline,” she said. Ideological instruction aims at building a democratic society; military training focuses on defending the Kurdish people.Watch: The Conversation “We never want the help of foreign powers like Israel and the United States,” she said. “We are an independent party.” The Kurdistan Free Life Party is one of several Iranian-Kurdish groups in Iraq. In 1979, Kurds in Iran supported the revolution against the shah. When the new Islamic Republic rejected their demands for autonomy, heavy fighting broke out in Iranian Kurdistan. Numerous groups relocated to Iraq, where they now operate freely in northern Iraq, which is largely autonomous from the rest of the country and detached from the central government in Baghdad. The six members of the political and military alliance are not in agreement about whether to invade if called on, and under what conditions they would embark on a full-scale war for their political goals. Some parties appear eager to take on a ground offensive in Iran. Reza Kaabi, secretary-general of the Komala of the Toilers of Kurdistan, has even set out a blueprint, declaring a U.S.-enforced no-fly zone to be a prerequisite for any Kurdish invasion. There is a general sense in the region that PJAK — given its proximity to the Iranian border and its relatively strong military presence — would be one of the first of the six Kurdish militias in the coalition to go into Iran if given U.S. military support. But PJAK publicly rejects the idea that they would do so at the bidding of Washington. It’s a stance rooted in distrust of the U.S. — not least because the United States abruptly withdrew support from the Kurds in Syria in January. Asked under what conditions PJAK would launch an offensive across the Iraqi-Iranian border, Avrin declined to answer. But, she said, her organization has “never waited for any force to bring about change.” CNN recently reported that just a few days into the Iran war, Trump spoke with Mustafa Hijri, the secretary-general of another group in the Kurdish-Iranian opposition alliance: the Democratic Party of Iranian Kurdistan, or PDKI. It is one of the oldest Iranian-Kurdish opposition parties and has maintained armed units operating from exile in northern Iraq. PDKI executive committee member Hassan Sharafi said in an interview that he could “neither confirm nor deny” whether such a conversation had taken place, in part because of the limited contact among the group’s leadership maintained for security reasons. Sharafi said the PDKI had “no operational relations” with the United States on the ground in Iraq. At the political level, however, contacts exist: “In Washington, Paris, and London we have contacts, and our representatives there maintain relations. Our relations are diplomatic and political.” Such links, he said, were long-standing: “For more than 20 years we have had relations with the United States and with all European countries. We have contacts with all of them.” THE ROAD TO TEHRAN From Tehran’s perspective, the militias represent a serious threat. Iranian artillery has struck in the border region multiple times in recent days, hitting villages near the frontier. These attacks primarily affect civilians. The Kurdish guerrillas sheltered inside the mountain remain protected. Other militia groups, whose positions are located in more exposed terrain, have also come under fire. A 2023 security agreement between Iran and Iraq obliged Baghdad to disarm Iranian-Kurdish opposition groups, dismantle their bases and relocate them deeper into Iraqi territory. Now that the Kurdish groups are openly considering an offensive in Iran, Tehran has concluded that the agreement has failed, according to Kamaran Osman, an Iraq-based human rights officer with a nonprofit organization called Community Peacemaker Teams that monitors human rights abuses in conflict zones. “Now it believes it must target, destroy and defeat these groups,” Osman said, speaking in the Iraqi city of Sulaymaniyah, about a two-hour drive from the PJAK base. As of Monday, his organization had recorded 307 Iranian attacks on the Kurdistan region in Iraq, leaving eight people killed and 51 injured. He sees only grim scenarios for the Kurdish people in Iran. “If the regime falls, there is a risk of civil war in Iran,” he said. If the regime survives, he fears more retaliation from Tehran against Kurds in Iraq — both Iranian-Kurdish opposition groups and the Kurdistan Regional Government. Should northern Iraq become destabilized, a power vacuum could emerge. The last time order eroded here, in 2014, ISIS militants seized control of a swathe of territory stretching from Iraq to Syria, a landmass nearly as large as the United Kingdom. PJAK has ties to the Kurdistan Workers’ Party, a militant group that has fought against the Turkish government, and is listed as a terrorist organization there — as well as in the EU and the U.S. The United States has a troubled history of making big promises to ethnic Kurdish groups — and then abandoning them at the worst possible moment. After calling on Iraqis to rise up and overthrow then-dictator Saddam Hussein in 1991, President George H.W. Bush declined to intervene when Hussein began slaughtering Iraqi Kurds who took up the U.S. president’s call. And as recently as this January, the Trump administration stood by as a Syrian Kurdish militia that led the U.S.-backed campaign to defeat ISIS just a few years ago was attacked by Syria’s new government. The big question for U.S. policymakers may be how much they would need to support a Kurdish assault on Iran to make it successful. Former U.S. intelligence and special forces experts believe it would require the type of commitment he might prefer to avoid: large infusions of cash and weapons, close air support, and potentially even on-the-ground aid from U.S. special forces. Even then, a Kurdish-led attack could fizzle, leaving Trump with two grim choices: Abandon the Kurds, or come to their rescue with even greater U.S. combat support. “It would require a lot of commitment on the U.S. side with a very unclear end state,” said Alex Plitsas, a former senior Pentagon official who worked on special operations and counterterrorism policy in the Middle East. While Coates cautioned that Trump had other, better options at hand, she argued that even modest U.S. military support for the Kurds — such as small arms shipments and limited air support — could threaten Iran’s increasingly brittle regime. The key, she said, was arming the exiled Kurds in Iraq in conjunction with other Iranian resistance groups inside the country to avoid the perception it was coming from outside. “The way this is going to be effective,” Coates said, “is not by a bunch of Iraqis invading Iran.” Drüten of WELT reported from Iraq. Sakellariadis reported from Washington. The Axel Springer Global Reporters Network is a multi-publication initiative publishing scoops, investigations, interviews, op-eds and analysis that reverberate across the world. It connects journalists from Axel Springer brands — including POLITICO, Business Insider, WELT, BILD, and Onet — on major stories for an international audience. 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