Ready to launch and... nothing. Why?

Russia was preparing for the first test in almost 8 years of 1 of the most crucial strategical weapons in the Kremlin propaganda. However, everything indicates that the hypersonic avant-garde yet did not take off. The reason for this decision remains unknown. The avant-garde, however, has a peculiar importance for the Kremlin – Vladimir Putin has been presenting it as a weapon capable of breaking the American rocket defence for years.