That's according to CNN, Ukrinform reports.
The U.S. was able to track the launches in real time, the sources said.
The launches were likely intended to test the weapons and send a message to the West about Russian capabilities, multiple sources told CNN.
Russia's Ministry of Defense said on Saturday that it had launched hypersonic Kinzhal missiles against a military ammunitions warehouse in western Ukraine on Friday, destroying the structure in the Ukrainian village of Deliatyn.
Hypersonic missiles can travel at a far lower trajectory than high-arcing ballistic missiles, which can be easily detectable. Hypersonics can also maneuver and evade missile defense systems.