Ukraine has lost at least 74 tanks—destroyed or captured—since Russia widened its war on the country starting the night of Feb. 23.

But Ukraine has captured at least 117 Russian tanks, according to open-source-intelligence analysts who scrutinize photos and videos on social media.

In other words, the Ukrainian army might actually have more tanks now than a month ago—all without building a single brand-new tank or pulling some older vehicle out of storage.

The Russians meanwhile have captured at least 37 Ukrainian tanks—a sum inadequate to compensate for the roughly 274 tanks it is believed to have lost to all causes.

The disparity in captured tanks speaks to Russia’s lack of preparation for a high-intensity war against a determined foe. But it also speaks to the advantages any defender possesses over any attacker.