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The US successfully tested a hypersonic missile in mid-March but kept it quiet for two weeks to avoid escalating tensions with Russia as President Joe Biden was about to travel to Europe, CNN reported on Tuesday, citing a defense official familiar with the matter.

The Hypersonic Air-breathing Weapon Concept (HAWC) was launched from a B-52 bomber off the west coast, the official said, in the first successful test of the Lockheed Martin version of the system. A booster engine accelerated the missile to high speed, at which point the air-breathing scramjet engine ignited and propelled the missile at hypersonic speeds of Mach 5 and above.

The official offered scant details of the missile test, only noting the missile flew above 65,000 feet and for more than 300 miles. But even at the lower end of hypersonic range -- about 3,800 miles per hour -- a flight of 300 miles is less than 5 minutes.

At the time of the US test, Biden was preparing for a visit to NATO allies in Europe, including a stop in Poland where he met with Ukraine's foreign minister and defense minister.

The US has been careful not to take steps or make statements that could unnecessarily escalate the tensions between Washington and Moscow. On Friday, the US canceled a test of the Minuteman III intercontinental ballistic missile (ICBM) to avoid any misinterpretation by Russia. Austin had already postponed the test in early March to avoid any actions that could be misconstrued by Russia at such a sensitive time.

In general, the US has also remained somewhat discreet about the weapons and equipment it sends into Ukraine. Only in the latest $300 million security assistance package did the Defense Department list specific systems and weapons.