secede

1. V-I If a region or group secedes from the country or larger group to which it belongs, it formally becomes a separate country or stops being a member of the larger group. (從國(guó)家或大集團(tuán)中正式)脫離

Singapore seceded from the Federation of Malaysia and became an independent sovereign state. 新加坡脫離馬來(lái)西亞聯(lián)邦成爲(wèi)一個(gè)獨(dú)立的主權(quán)國(guó)家。

Ukraine decided to secede. 烏尅蘭決定獨(dú)立出來(lái)。