The Trump administration's ongoing Pentagon review of US force posture in Europe, with partial troop reductions already underway such as the May 2026 withdrawal of approximately 5,000 personnel from Germany, has fueled trader attention to NATO commitment levels. Officials describe these steps as part of a shift toward a European-led "NATO 3.0" model focused on conventional defense against Russia while redirecting resources toward the Indo-Pacific. Recent actions include selective ally participation in planning groups and public comments from President Trump and Ambassador Matthew Whitaker emphasizing burden-sharing and potential re-evaluation of relations with non-cooperative members. Countervailing factors include the 2023 Kaine-Rubio statute requiring congressional authorization for treaty withdrawal, a new bipartisan NATO Shield Act proposal mandating legislative approval and reporting, and administration statements that full exit from the alliance is not planned. The review is slated to conclude by December 2026.