 At the same time, implementation of the U.N. Oil-for-Food Programme brought revenue to northern Iraq, allowing for increased standards of living.Iraqi Kurdistan became a relatively peaceful region, before the small terrorist group Ansar al-Islam entered the Halabja region in December 2001, bringing renewed conflict that would end in 2003 immediately prior to start of Iraq war, which mainly affected non-Kurdish areas of Iraq.Around a month later, U.S. President Bill Clinton signed the Iraq Liberation Act into law, providing for military assistance to Iraqi opposition groups, including the PUK and KDP.