"London's actions will inevitably carry consequences for which it will have to answer."
This was the short and not-very-sweet response from the Russian Embassy, after it was confirmed British-made drones were used in recent Ukrainian strikes deep inside Russia.
Drone strikes have been used to great success by Ukraine recently, causing serious damage to military, economic and industrial infrastructure in Russia.
The Ministry of Defence defended the use of its weaponry, claiming the UK will continue to stand "shoulder to shoulder" with Ukraine against "Russian aggression".
It’s not the first time Russia has used this sort of threat – so how seriously should we take it this time?
Niall Paterson is joined by Sky’s Moscow correspondent Ivor Bennett.
Have you got a question for Niall? Email us: why@sky.uk.
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