Why? SM6Blk1B does everything that SM4 was ever supposed to do. And more.
Just a thought, the SM-4 was supposed to have been built from old RIM-66s. So I think it's worth looking at if it can be implemented fairly quickly and inexpensively, this a missile that would be of benefit to the Ukrainians and it would save the cost of having to de-mil old SM-1s.
Edit: I checked and they were supposed to be made from old RIM-66 SM-1s.
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