A no-fly zone has been put in place over the Sandringham Estate after drone sightings were reported during the visit of Ukraine’s president last month.

The restrictions were requested by security services after the King hosted Volodymyr Zelensky at the Norfolk site on 2 March.

The order, which came into force on 10 March, restricts aircraft flying below 2,000ft (610m) for “reasons of public safety and security”.

It was signed off by Transport Secretary Heidi Alexander. Buckingham Palace has not commented.

The order states: “These regulations impose restrictions on flying in the vicinity of Sandringham House, Norfolk.

“In view of the need for security members of the Royal Family and other dignitaries staying at or visiting Sandringham House and at the request of the security services, it has been agreed by the Civil Aviation Authority and the Department for Transport that flying should be restricted in the vicinity of that location for reasons of public safety and security.”

Royal flights, visitors’ aircraft and emergency services are exempt from the rules.