“Have we seen a marked difference since we have provided tanks to Ukraine, in terms of the battlefield? Similarly, on F-16s, have we seen a marked difference? Our view has been that there’s not one weapons system that makes a difference in this battle. It’s about manpower. And Ukraine needs to do more, in our view, to firm up its lines, in terms of the number of forces it has on the front lines. It’s about munitions, and it’s about all of the other things that go to a country’s national strength, their morale, their cohesion, their industrial base.”

– Biden national security adviser Jake Sullivan, asked about the slow issuance of tanks and fighter jets to Ukraine as it fights a war against a country nearly four times its population.