Russian Foreign Minister Sergei Lavrov has said that there were "no weapons" on board the Syrian plane grounded by Turkey on Wednesday.
He said the plane was carrying 'legal' shipment of equipment for radar installation.
We have no secrets. There were, of course, no weapons on the plane and could not have been any. There was a cargo on the plane that a legal Russian supplier was sending in a legal way to a legal customer.
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Mr Kim has made two recent visits to China.
The study looked at the development of 422 children over the course of eight years.
The president said they will come into force if China refuses to change its practices.