London Mayor Boris Johnson said that Russian President Vladimir Putin should "strip to the waist" and take part in the Olympic judo event.
Mr Putin, who holds a black belt in the martial art, will visit Downing Street before heading to the Olympic Park.
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Harry and Meghan left Windsor Castle during Sunday afternoon after being hosted by the Queen and Duke of Edinburgh over the weekend.
Clare Waight Keller said it was an "enormous honour" to have been given one of fashion's most coveted jobs ahead of the royal wedding.
As temperatures rise over the coming few days, the risk of thunderstorms across some southern parts