Zechariah 9:10 prophesies that the King’s "dominion will be from sea to sea, and from the River to the ends of the earth." This is the promise of a global, all-encompassing reign that supersedes the localized boundaries of the Old Covenant land.
Fulfilled Eschatology rejects the idea that this reign is waiting for a future millennium. Jesus declared after His resurrection, "All authority in heaven and on earth has been given to me" (Matthew 28:18). His dominion is a present reality, advancing through the Gospel as nations are "brought near" to God. He is currently King of Kings, and His Kingdom knows no end.