9月17日，在纽约联合国总部，中国常驻联合国代表李保东（左）在共同声明上签字。当日，联合国安理会五个常任理事国的常驻联合国代表在纽约联合国总部签署共同声明，再次确认蒙古国的无核武器地位，并向蒙方提供相应的安全保证。新华社记者 申宏 摄   On September 17,The United Nations headquarters in New York,China's permanent representative to the united nation LiBaoDong(left)In a joint statement signed on.On that day,The United Nations security council's five permanent members of the permanent representative to the United Nations headquarters in New York signed the joint declaration,Again confirmed Mongolia's nuclear-weapon-free status,MengFang and to provide the corresponding security guarantees.The xinhua news agency reporter was taken