"We are extremely concerned for the protection of this group, which includes up to five minors, who are at risk of severe punishment and ill-treatment," said Rupert Colville, spokesman for the UN high commissioner for human rights.
"We are dismayed that the governments of Laos and China appear to have abrogated their non-refoulement obligations, especially given the vulnerability of this group, all of whom are reported to be orphans," Colville told reporters in Geneva.
The nine, arrested in Laos some three weeks ago, were returned to neighbouring China on Monday and flown back to North Korea the following day.
North Korean defectors traditionally try to make the journey to South Korea by first heading to China and then proceeding onwards from other countries.
Laos previously had been seen as a relatively safe transit point.
"We urge the Chinese and Laotian authorities to publicly clarify the fate of the nine young North Koreans, as well as the conditions under which they were returned," Colville said.
North Korean leader Kim Jong-Un is believed to have tightened border controls since he came to power after the death of his father Kim Jong-Il in December 2011.
The number of refugees arriving in South Korea plunged more than 40 percent to 1,508 last year.
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