Police fired shots outside the Ukrainian embassy after the ambassador’s car was “deliberately rammed”.
The embassy, located in Holland Park in west London, said the official car of the Ambassador of Ukraine to the UK, Natalia Galibarenko, was attacked on Saturday morning at around 10am.
Scotland Yard said a vehicle was driven at police officers when they arrived at the scene.
Police firearms and Taser were discharged, the vehicle was stopped and a man, aged in his 40s, was arrested, the Metropolitan Police said.
The man, who was not injured, has been taken to a central London hospital as a precaution.
Police said both armed and unarmed officers were deployed to the incident “as part of the protective security arrangements for London”.
The Met said officers were called at approximately 8.30am to reports of a car in collision with a number of parked vehicles near the Ukrainian embassy.
The incident is not being treated as terrorist-related. A statement from the Ukrainian embassy said: “Around 10am on Saturday 13 April, the official vehicle of the Ambassador of Ukraine to the United Kingdom was deliberately rammed as it sat parked in front of the Embassy of Ukraine’s building.
“The police were called immediately, and the suspect’s vehicle was blocked up.
“Nevertheless, despite the police actions, the attacker hit the Ambassador’s car again.
“In response, the police were forced to open fire on the perpetrator’s vehicle.