Tensions have been running high on the divided Korean peninsula ever since the North conducted its fourth nuclear test in January followed by a long-range rocket launch.
In the past month, a new source of friction has emerged with two cases of group defections by North Korean staff working in Pyongyang-run restaurants in China.
A dozen women and their restaurant manager arrived in Seoul in April, and three others from a separate restaurant followed them this week.
"The allurement and abduction clearly proves that the puppet forces of south Korea are the most hideous human rights abusers," a spokesman for the North Korean Red Cross said in a statement.
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Referring to the latest case of the three women who had been working in a restaurant in the northern Chinese province of Shanxi, the spokesman said they were the victims of a sophisticated, "premeditated abduction".
He said South Korean agents "lured" the women away from their work and spirited them across the border with Laos and then into Thailand.
"We hope North Korea will look back on the continued defections and use it as an opportunity to improve the human rights and livelihoods of its people," ministry spokesman Jeong Joon-Hee said.
The South Korean government estimates that Pyongyang rakes in around USD 10 million every year from about 130 restaurants it operates -- with mostly North Korean staff -- in 12 countries, including neighbouring China.
Tough UN sanctions imposed on North Korea after its January nuclear test significantly curtailed the isolated state's ability to earn hard currency, making the restaurants an even more important source of income than before.