The UN Secretary General Ban Ki-moon has said that if it is proved that chemical weapons were used in Syria the Security Council has an obligation to act but he added that the use of force would only be legal with UN approval. Nick Bryant reports. While the UN Secretary General Ban Ki-moon stop short of using the word illegal to describe any possible military action by America against Syria. He said the use of force would only be lawful in self-defense or it backed by the Security Council. If confirmed the use of chemical weapons would mark a serious violation of international law, he said but a military response could unleash more turmoil. "______________________________________________ At the same time, we must consider the impact of any punitive measure on efforts to prevent further bloodshed." 联合国秘书长潘基文表示,如果证实叙利亚确实使用了化学武器,安理会有义务采取行动,但是他补充说,只有在联合国批准的情况下,使用武力才是合法的.尼克`布莱恩特报道. 联合国秘书长潘基文停止使用"非法"这个词来形容美国可能对叙利亚采取的任何军事行动.他表示,只有出于自卫或者在安理会支持的情况下,使用武力才是合法的.如果经证实叙利亚使用了化学武器,那么这样的行为将严重违反国际法,但是使用武力将引起更多骚动. "___________________________________________同时,我们必须考虑任何惩罚性措施可能造成的影响,防止未来发生血腥事件."