In June 2010, North Korea threatened "harsher punishment" if the United States continued its "hostile approach" in the follow-up to the sinking of the ROKS Cheonan, a South Korean warship.
After the sinking of ROKS Cheonan, he suffered strong criticism of his handing about the incident.
At the same time, Song has provided products to mothers and babies in North Korea through an agreement with the Korea Peace Foundation, which opened a door that was shut after the North's sinking of the Cheonan.
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The head of the government-funded Korea Institute for National Unification, Kim Tae-u, proposed that the South Korean government renegotiate the Mount Kumgang Tourist Region with North Korea without any official apology from North Korea over the ROKS Cheonan sinking and the Bombardment of Yeonpyeong.