Grynkewich, speaking in Brussels ​where he met with military chiefs ​from NATO countries, added that European allies and Canada are taking more responsibility for ​the conventional defence in Europe ​with continued backing from the U.S. capabilities, ‌which ⁠are being adjusted.

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"As the European pillar of the alliance gets stronger, this allows the U.S. to reduce ​its presence ​in ⁠Europe and limit itself to providing only those critical ​capabilities that allies cannot yet ​provide," ⁠Grynkewich said, adding that he couldn't provide an exact timeline but ⁠that ​it would be an "ongoing ​process for several years".