Beginning in 1996, the U.S. also started shipping food aid to North Korea through the United Nations World Food Programme (WFP) to combat the famine. Shipments peaked in 1999 at nearly 600,000 tons making the U.S. the largest foreign aid donor to the country at the time. Under the Bush Administration, aid was drastically reduced year after year from 320,000 tons in 2001 to 28,000 tons in 2005.[61] The Bush Administration was criticized for using "food as a weapon" during talks over the North's nuclear weapons program, but insisted the U.S. Agency for International Development (USAID) criteria were the same for all countries and the situation in North Korea had "improved significantly since its collapse in the mid-1990s."