U.S. Secretary of State Marco Rubio is in a trip aimed at easing concerns among European NATO allies about the Trump administration’s intentions toward the alliance. Rubio is scheduled to attend a NATO foreign ministers’ meeting in Sweden on Friday, with the session coinciding with expected Pentagon briefings to the alliance on U.S. plans for its military commitment to European defense. The foreign ministers’ meeting takes place ahead of a NATO leaders’ summit in Turkey in July.

The diplomacy occurs amid broader uncertainty affecting NATO planning. Multiple sources note uncertainty over how the war in Iran will develop and whether U.S. efforts to broker an end to the Russia-Ukraine conflict—described as stalled—will resume. At the same time, some European resentment persists over Trump’s public criticism of allies and reported interest in taking over Greenland, a territory associated with NATO ally Denmark.

Rubio’s role is described as one of reassurance, seeking to present a calmer U.S. posture and reduce tension around potential changes and troop reductions, while maintaining momentum leading into the July summit.