Ukrainian forces are using their home-turf knowledge to stymie Russia, the top U.S. general says.

General Milley met with NATO’s secretary general, Jens Stoltenberg, in Brussels before traveling to Stuttgart, Germany, to confer with America’s European Command.

Mr. Stoltenberg said the Ukrainian military, which has been backed in recent days with arms shipments from NATO countries, was “performing better and putting up more resistance than most experts expected, and surely more than Russia expected.”