If North Korea goes ahead with reunions of families separated by the 1950-53 Korean war it is going to expect rewards from the South in return, perhaps the reopening of a border tourist spot or even tacit acceptance of an expected missile test.
South Korean President Park Geun-hye wants to build confidence with the unpredictable North under her policy of "Trustpolitik".
But the South is loath to rush back into negotiations as it draws up a strategy for government-level contacts to follow an accord in August that defused the latest confrontation between the old rivals.
Reunions of families separated by the war have been held several times since 1985, providing the opportunity for humanitarian cooperation, and perhaps a first step to building ties, amid poignant scenes of elderly folk meeting long-lost loved ones.
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