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.
More top news
Derby was unable to play with other dogs after being born with severely deformed front legs - but can now run freely.
The judge said the 14-year-old had been subject to a great injustice. He was executed for the murder of two little girls in 1944.
It will be a dull and damp day today, with heavier and more persistent rain to the northwest and across Wales.