I'm familiar with the book of Malachi; no, it does not limit God's love to only U. S. citizens. Just for the tally book.
I'm a life long Christian. I have a deep and abiding concern for people all over the world to know the love of God and have a relationship with Him generating eternal life. However, that does not mean that secular law should be ignored.
I hope Ted Bundy came to a relationship with Jesus Christ prior to his execution. That doesn't mean I think we should have simply turned him loose and sent him on his way.