Russian oligarch Arkady Rotenberg donated £2.2 million to fund a pool complex at Lambrook School in Berkshire.

Prince George, Princess Charlotte, and Prince Louis, who all attend the school, are the children of Prince William and Kate Middleton.

Mr. Rotenberg is a close friend of Russian President Vladimir Putin and has been sanctioned by the British Government.

The two men met during childhood, and Mr. Rotenberg used to be Mr. Putin's judo sparring partner.

Mr. Rotenberg is the former chief of the largest gas pipeline constructor in Russia.

The school has been criticized for accepting the donation given Mr. Rotenberg's connections and sanctions.

Lambrook School claims to comply with all appropriate legislation and undertakes strict due diligence for charitable donations.

The donation was made around 2011, a decade before the royal children enrolled.

There is no suggestion of wrongdoing by Lambrook School.