President Vladimir Putin said Friday that Russia will continue to test and start mass-producing the hypersonic ballistic missile that it fired at Ukraine Thursday.

Russia fired a hypersonic intermediate-range ballistic missile at the Ukrainian city of Dnipro on Thursday in response to the U.S. and UK allowing Kyiv to strike Russian territory with advanced Western weapons,

This is the first time Russia has used its so-called Oreshnik intermediate-range ballistic missile in combat. The launch also serves as a warning to the West.

The Pentagon confirmed Russia’s missile was a new, experimental type of intermediate-range missile based on its RS-26 intercontinental ballistic missile.