Acting under Chapter VII through the unanimous adoption of United States-led resolution 1851 (2008), the Council called on those States and organizations able to do so to actively participate in defeating piracy and armed robbery off Somalia's coast by deploying naval vessels and military aircraft, and through seizure and disposition of boats and arms used in the commission of those crimes, following on a 9 December 2008 letter from the Transitional Federal Government for international assistance to counter the surge in piracy and armed robbery there.