ADDIS ABABA, Ethiopia (AP) ? A resumption of peace talks to end South Sudan#39;s violence and political impasse appears to be in peril, as members of the two sides exchanged bitter accusations late Tuesday ahead of what is supposed to be the start of new talks. South Sudan descended into chaos in mid-December as fighting broke out between troops loyal to the government and rebels who support the former vice president. Thousands were killed in violent rampages that often took on an ethnic dimension. A cease-fire was agreed to last month and more advanced...