Since Yahweh is speaking this can be stated in first person. AT: "Therefore, this is what I, Yahweh the Lord, say" (See: [[rc://en/ta/man/translate/figs-123person]])
The word "hand" represents control. AT: "I put it in the power of the strongest nation" or "I gave the strongest nation power over it" (See: [[rc://en/ta/man/translate/figs-metonymy]])