What does Ezekiel 38:2 mean?

He said, 'Son of man, turn your attention toward Gog, who rules over the land of Magog, the chief leader of Meshech and Tubal. Speak out against him.' Ezekiel 38:2 - Modern Text Bible

(God tells Ezekiel to focus on Gog, a symbolic enemy leader, and to deliver a message of judgment.)