The Chinese people treasure peace and we absolutely do not engage in invasion and expansion.However, we have the confidence to conquer all forms of invasion : Xi told government leaders  and current and retired PLA members.

参考译文：中国人珍爱和平而且我们绝对不会参与侵略和扩张，然而，我们有信心打败任何形式的侵略，习总书记告诉政府领导人和目前已退休的PLA成员。

解答如下：

填however 然而;不过;仍然,当然还可以填Nevertheless

(1)however adv.然而;不过;仍然

This was not an easy decision. It is, however, a decision that we feel is dictated by our duty. 

这很难抉择。不过，我们觉得自己有义务作出决定。

Some of the food crops failed. However, the cotton did quite well.  

有些粮食作物歉收。但棉花的收成仍相当不错。

(2)nevertheless adv.然而;不过

Most marriages fail after between five and nine years. Nevertheless, people continue to get married.

大部分婚姻在婚后第五至第九年间失败，然而，人们仍会选择结婚。