On April 13, 2008, Pyongyang agreed to dismantle the Yongbyon facility as part of an aid-for-disarmament deal, and in response, the US removed North Korea from its terrorism blacklist. Despite requests from the South Korea government to put North Korea back on the list after it sank the Navy ship the ROKS "Cheonan" in 2010, the Obama administration stated that it would not do so because the act was conducted by only the North Korean military and was thus not an act of terror. However, following the incident, the Obama administration also stated that it would then closely monitor North Korea for signs for a return to international terrorism. US State Department spokesman P.J Crowley also said that returning North Korea to the list was under continual review.