But Ukraine and its allies signaled that the Russian offensive could be contained.

“The Russians don’t have the numbers necessary to do a strategic breakthrough, we don’t believe,” said U.S. General Christopher Cavoli, NATO’s Supreme Allied Commander Europe.

“More to the point, they don’t have the skill and the capability to do it; to operate at the scale necessary to exploit any breakthrough to strategic advantage,” Cavoli told reporters Thursday, adding that he was confident…