On June 18, U.S. Defense Secretary Pete Hegseth announced a review of American forces in Europe lasting up to six months and including congressional consultations. The review addresses NATO allies' defense spending, basing rights, and contributions, following a reported $90 billion increase in European and Canadian defense expenditures in 2025. Some allies denied U.S. overflight and basing access during the Iran conflict, prompting immediate cuts to certain NATO crisis force contributions.