Claims from both sides are difficult to confirm because journalists and independent observers do not have access to the front lines . South Sudan 's president cancelled the Shanghai leg of his China trip . His comment during a visit to Beijing marks the latest in fiery political rhetoric . Relations between the nations draw alarm from the international community . China -- a crucial trading ally to both nations -- urges restraint and negotiations .
South Sudan 's president cancelled the Shanghai leg of his China trip . His comment during a visit to Beijing marks the latest in fiery political rhetoric . Relations between the nations draw alarm from the international community . China -- a crucial trading ally to both nations -- urges restraint and negotiations .