K.
His country owes you $12 million.
Your venue of claim is Israel and is unenforcable in the United States a sovereign of and by itself.
Your lawyers took your money and did as you asked but that is as far as this is going.
The Warwick is not a proxy Sheriff to enforce your claim.
But, if it makes you feel better... fine by me.
The hotel should be shunned by all decent humans for allowing this murderer to stay there.