"God's throne is the ark of the covenant, between the cherubim and beside the book of the covenant. As the Lord, the King controls his realm and speaks with authority. He also stands with his people, to pretect and defend them, to provide justice and mercy.
But God is King not only of Israel, but of all the nations, indeed of the whole earth -
Exodus 15:18 (NKJV)
18 “The LORD shall reign forever and ever.”
Psalm 22:28 (NKJV)
28 For the kingdom is the LORD’s, And He rules over the nations.
All of Psalm 96, 97, 98, 99, and 145 (ok, so I won't write these all out)
God rules all because he is God and brings all things to pass, but also...because he is related to the whole creation by covenant." - Frame, ST, p92.