SEOUL, South Korea (AP) — China’s recent offer of aid to North Korea could undermine U.N. sanctions against Pyongyang and help feed a cycle of failed negotiations aimed at ending the isolated country’s nuclear program, a former U.S. negotiator said Thursday.Last week, Chinese Prime Minister Wen Jiabao visited the poor north, which relies on outside assistance to feed its people, armed with a reportedly $20 million aid package. –Contact The Daily Reveille’s news staff at [email protected]