“This will put Nato on the track for lasting, sustained success, especially as we confront simultaneous challenges across theatres,” he also said. Colby had previously called for a reboot of the alliance into what he coined “Nato 3.0.” But the six-month Pentagon review was first announced by defence secretary Pete Hegseth during a Nato defence ministers’ meeting in Brussels on 18 June. Thanks to increases in Nato defence expenditure targets (from two to five percent GDP), allies are “strongly positioned” to take responsibility for Europe’s defence, “with critical but more limited US support,” reads the strategy. But experts argue that the removal of American troops in Europe goes not only against Europe’s security and stability but also against wider US interests.