Russia claims to have used hypersonic missiles for the first time in its war against Ukraine.
Western analysts say Moscow has been forced to use the weapons because other forms of attack are failing.
Russia says a video shows its newest weapon – the hypersonic Kinzhal missile – in action.
It can hit a target up to 2,000km (1,240 miles) away, fly at up to 10 times the speed of sound and be used to deliver nuclear weapons.
Moscow claims it has twice deployed the missile, nicknamed the Dagger, as it steps up its attack on Ukraine.
A fuel depot in the south of the country was targeted.
Military experts say they are being used because Russia's ground attack is faltering.
Security analyst Dominika Kunertova told Forces News: "This use of Kinzhal hypersonic missile is really like weapon propaganda.
"On one hand, it has this reputation of a wonder weapon, but on the other hand, it looks like Putin is basically signalling that he is exhausting his existing effective missiles and it's signalling, kind of, loss of momentum in the war".
But there is a fear the missiles could go off target – into NATO territory.
Ukraine's government has confirmed the attacks but said it was not yet able to say what type of missiles were used.
Thumbnail image: Russian MOD.