CNN —

Ukraine’s large-scale drone attack on Russian air bases thousands of miles behind the front lines is the latest in a long line of daring missions by Ukraine’s forces against its giant neighbor.

The operation, more than a year and a half in the making, involved drones being smuggled into Russian territory and hidden in wooden mobile houses atop trucks, according to a source in the SBU, Ukraine’s domestic intelligence agency.

The strikes caused an estimated $7 billion in damages and hit 34% of Russia’s strategic cruise missile carriers at its main air bases, the source said. The assault also showed that Ukraine still has the ability to pressure Russia even as Moscow ramps up its own attacks and offensive operations.

Here’s a look at some of the Ukrainian force’s most significa

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