A South Korean think tank said the international community must shift gears in designing sanctions to pressure North Korea’s economy, from those restricting North Korea’s commodity trading to those striking its labor force exports.

The Korea Institute for National Unification (KINU) on Monday published its analysis of how the international community can impose effective sanctions on North Korea’s sources of funding.

The analysis implies that a sharp increase in China-DPRK trade began after the May 24 Measures were implemented in 2010 by South Korea’s former president, Lee Myung-bak, halting nearly all inter-Korean trade.

North Korea has handed in “hard currency”