Trump Covid-19 diagnosis puts America's friends and foes on alert

As featured in NBC News



"The United States is the ultimate guarantor of European security," said Jonathan Eyal, associate director of strategic research partnerships and international director at the Royal United Services Institute, a security think tank. "If you have a rudderless United States, then these things will matter," Eyal said. "It's still by far the biggest single military power and economic power."