It began with a peace move nobody wanted and ended with an experimental missile strike so rare in war Moscow gave a 30-minute heads-up to Washington.

Russian President Vladimir Putin warned the United States and Ukraine’s other partners that the weapon could be deployed against their interests as well.

The Kremlin said on Friday that a strike on Ukraine using a newly-developed hypersonic ballistic missile was designed to warn the West that Moscow will respond to moves by the U.S. and Britain to let Kyiv strike Russia with their missiles.