() Army Secretary Daniel Driscoll is set to testify before the House Armed Services Committee on Wednesday.

His testimony comes in the wake of Ukrainian drone attacks deep inside Russian territory that have raised fears about whether the United States would be prepared to deal with similar attacks.

A significant number of Russian warplanes were destroyed in the attack, dealing a blow to the country and pushing the limits of what drone warfare can accomplish.

Ukraine did not give the U.S. advance notice of the operation, which included drones that were smuggled into U.S. territory.

Russia is expected to launch a counterattack, though there has not yet been any sign of what form the retaliation may take.