Police had opened fire on the vehicle after the driver "deliberately rammed" into the diplomat's auto and then drove at officers.
A man, who attacked the official vehicle of the ambassador of Ukraine in Great Britain Natalia Halibarenko, was taken into custody in London.
No one was hurt in the incident, which happened early on Saturday outside the embassy building in the affluent Holland Park area of west London, and it was not being treated as terrorism, police said in a statement.
He said the vehicle was "blasting Ukrainian music in some kind of protest against the embassy" after arriving at about 7am.
London police have fired gunshots at a man who rammed into a diplomatic vehicle parked outside Ukraine's Embassy, and then tried to drive into officers.
London's Metropolitan Police said firearms and stun guns were used to stop and detain a suspect who drove a vehicle at a police auto when police arrived on the scene.
Witnesses said 10 or more gunshots had been fired. As police officers arrived at the scene, the vehicle then drove towards them, prompting them to open fire, shooting at the driver through the auto window.
The vehicle, which a police source said was a Mercedes, appeared to have been backed into the black auto.
Chief Superintendent Andy Walker says, under standard procedure, the use of a police firearm in Britain is now being formally investigated.
"He has been taken to a central London hospital as a precaution".
Footage showed armed police surround the vehicle before smashing the driver's window and using a Taser on the screaming suspect.
The Met said the Directorate of Professional Standards had been informed.
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