• The Trump administration is moving to withdraw approximately 20,000 U.S. troops from Europe and is reviewing significant reductions in Iraq and South Korea.
  • These moves are explicitly conditioned on host nations increasing their defense spending, with NATO allies urged to spend at least 5% of GDP.
  • The policy has sparked intense negotiations with allies and warnings from security analysts about potential regional instability and a weakening of U.S. deterrence.

In a significant shift in U.S. global military posture, the Trump administration is actively pursuing plans to withdraw substantial numbers of American troops from several key allied nations. The effort, which began in January 2025 with an announcement to pull roughly 20,000 personnel from Europe, is now expanding to include a review of the U.S. footprint in Iraq and South Korea, according to people familiar with the internal policy discussions.

The administration's rationale hinges on long-running complaints about burden-sharing. Officials are pressing allies to dramatically increase their own defense expenditures as a condition for continued U.S. military presence. For NATO members, the administration is pushing for a target of 5% of GDP on defense, a stark increase from the current EU average of just 1.9%. Without such commitments, the U.S. is prepared to significantly retrench its forces, a move that would realign decades of security agreements.

In Europe, the planned withdrawal targets troops that were stationed following the 2022 Russian invasion of Ukraine, raising immediate concerns about the continent's ability to deter future aggression. European leaders, while acknowledging the need for greater investment, have privately urged a more measured approach, arguing that an abrupt U.S. drawdown could create a dangerous security vacuum. “What institutional investors like us are really focused on is regulatory stability,” one European official said, drawing a parallel to financial markets. “The same is true for security. Sudden changes in posture are destabilizing.”

The situation in Iraq is particularly time-sensitive. The administration is facing a September 2025 deadline to decide whether to continue, accelerate, or curtail a planned withdrawal aligned with the end of Operation Inherent Resolve. Military advisors have warned that a near-total withdrawal, similar to the 2011 pullout, could risk a resurgence of terrorist groups like ISIS and cede influence to Iran. Attempts to reach officials at the Pentagon for comment on the Iraq timeline were not immediately successful.

Perhaps the most contentious discussions center on South Korea, where Trump has long signaled an intent to decrease or eliminate the U.S. military footprint, often linking the issue to trade grievances and cost burden-sharing. A reduction of thousands of troops is now under formal review. Such a move would trigger a political and defense crisis in Seoul and could embolden North Korea, analysts warn, fundamentally undermining the deterrence that has maintained stability on the peninsula for decades.

The overarching strategy appears to be a part of a broader retrenchment aimed at prioritizing U.S. resources for countering China. By threatening abandonment, the administration believes it can secure both financial concessions and force allies to assume greater responsibility for their own defense, potentially freeing American assets for a strategic pivot to the Indo-Pacific. However, critics within bipartisan congressional circles and the foreign policy establishment argue the tactics weaken U.S. global leadership and could inadvertently empower adversaries in Moscow, Beijing, and Pyongyang.