U.S. Secretary of State Marco Rubio has warned of a potential reassessment of American military presence in Europe, citing restrictions by NATO allies on base access during operations.

The warning follows recent instances where several European nations limited U.S. access to strategic military facilities during ongoing regional operations. Rubio expressed frustration over allies blocking access to bases that the United States funds and staffs.

What Triggered the Warning

The dispute centers on disagreements between Washington and European partners over military cooperation and regional security strategy. Some allies have declined to support certain American operations or permit base usage for specific missions.

Rubio suggested that closing installations and withdrawing troops remains an option if restrictions continue. “If our allies won’t grant access to bases we maintain, we need to reassess our commitment,” he indicated in recent statements.

The Broader Implications

The friction reflects deeper divisions over the scope of mutual defense obligations within NATO. These tensions come as the alliance faces questions about burden-sharing and the conditions under which members must support one another.

European officials have not yet responded formally to Rubio’s warning. The dispute could reshape decades of transatlantic security arrangements if left unresolved.

This story has been updated. CNN’s International Desk contributed to this report.