Russia says it has successfully test-launched a hypersonic missile, one of a range of nuclear-capable weapons announced by President Vladimir Putin earlier this month.
The country's defence ministry released video footage showing the missile detaching from a fighter jet and leaving a fiery trail behind it.
It said the intended target was hit.
On 1 March, Mr Putin described the Kinzhal missile - named for a type of dagger - as "an ideal weapon".
He said it was part of a new stockpile of "invincible" weapons.
The Kinzhal is said to travel at 10 times the speed of sound and have a range of 2,000km (1,200 miles).
