He specifically mentioned the threat (he used that word specifically) of Iran's ballistic missile capability and nuclear weapon capability. In fact, he called Iran "an existential threat".
While he did say that he has not yet had time to confirm the reports with an official briefing himself, he did say that Trump's actions have made the world a safer place.
He also said that 22 nations including most of the NATO Alliance have now come together on this.
Further, he noted that he hopes the US public comes to support Trump's actions because they are critically important.
But, I mean, he's just the Secretary General of NATO, right? He's not a UHND Open Board expert.
Link: https://www.cbsnews.com/video/nato-secretary-general-mark-rutte-says-hes-had-several-conversations-this-week-with-trump/