N'DJAMENA, June 10 (Reuters) - President Idriss Deby appeared on Sunday to tone down Chad's resistence to a possible U.N. or European military force on its volatile eastern border with Sudan's Darfur region. After meeting new French Foreign Minister Bernard Kouchner, Deby was asked by journalists about the possiblity of U.N. blue helmets or European troops being deployed, and replied: "Why not?". Chad has previously favoured deploying only an international force of police to the area.