The Ukrainian president also said a large number of people were "officially missing", meaning the total death toll is thought to be much higher.

Their call comes in the wake of a flurry of visits by Western leaders to China in recent months.

Gus Lamont was last seen playing outside his home on a remote sheep station on 27 September.

Gus Lamont was last seen playing outside his home on a remote sheep station on 27 September.