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
David Cameron wants to clear out international corruption, but is sweeping his own backyard first.
Persistent rain will affect much of Northern Ireland, Southern Scotland and Northern England for much of the day.
The 74-year-old Prisoner Cell Block H actress will face court next month charged with the indecent assault of a 13-year-girl in the 1980s.