Georgia’s ruling party decisively won a second round of voting on Sunday, giving it more than three quarters of seats in parliament, enough to change the constitution if it wants, data from the Central Election Commission showed on Monday. The result cements Georgian Dream’s already firm grip on power in the ex-Soviet nation and is a crushing defeat for the opposition United National Movement (UNM) and its founder, former president Mikheil Saakashvili, a regional governor in Ukraine who has spoken of a possible return to his homeland. Georgian Dream, which came to power in 2012, is pro-Western but also favors closer ties with Russia, while the UNM is strongly pro-Western.