The culprit was apprehended and taken to a police station.
London's Metropolitan Police confirmed they were called to reports of a vehicle hitting a number of parked cars near the Ukrainian embassy.
Armed police opened fire on a auto that drove into the Ukrainian ambassador's official vehicle in London this morning. No one of the Embassy staff were injured. "The police are investigating the suspect's identity and motive for the attack". Armed officers arrived and surrounded the suspect's auto.
Chief Superintendent Andy Walker, from the Metropolitan Police's specialist firearms command, said: "As is standard procedure, an investigation is now ongoing into the discharge of a police firearm during this incident".
Firearms officers swooped and the vehicle was then driven at police.
Officers used firearms and a Taser before arresting a man in his 40s.
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The incident is not being treated as terrorism, added police.
He wasn't injured but was taken to hospital as a precaution.
The black vehicle was heavily scuffed on its right-hand side.
A silver Mercedes raced towards the Ukrainian ambassadors vehicle as police shot at the driver through the window.
A woman who works at a nearby shop said she heard shots fired twice between 10am and 11am on Saturday.
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.