WATCH: Royal commentator says King Charles 'extremely frustrated' with Prince Andrew

King Charles has been dragged into Prince Andrew's Chinese spy scandal, reportedly leaving the monarch "extremely frustrated" with his brother.

The King is said to be exasperated that the Duke of York has "once more caused embarrassment for the monarchy" following revelations in newly released court documents.

Court documents have revealed that the King was allegedly aware of an investment fund in which Yang Tengbo, an alleged Chinese spy, was directly involved.

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