The former head of NATO is speaking at the University of Utah on Wednesday.
Anders Fogh Rasmussen will make a case for broader U.S. military involvement as the alliance turns its attention back to Europe after years of focusing elsewhere.
Russia's part in the war in eastern Ukraine and the annexation of Crimea has already forced the organization to bolster air and sea patrols in former Soviet states.
"The current main challenge is Ukraine," Rasmussen said in advance of his Utah visit.
But it is not the only focus.
"We need a strong American presence in Europe. And we need it in the Middle East. That's indispensable," said the former prime minister of Denmark, who was NATO secretary general from 2009 until last year.