Russia 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 March 1, 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).
The defence ministry said the missile was launched from a MiG-31 jet that took off from an airfield in south-west Russia on Saturday.
"The launch went according to plan, the hypersonic missile hit its target," the ministry said.
Putin is widely expected to be re-elected as Russia's president in a week's time.
As part of his annual state of the nation speech on 1 March, he played a video graphic that appeared to show missiles raining down on the US state of Florida.
According to BBC, the US state department said this was not the behaviour of a responsible international player.