Roman Abramovich is worth $13.5 billion according to the Bloomberg Billionaires Index. Chris Brunskill Ltd / Contributor / Getty Images Israel's Holocaust museum asked the US not to sanction a Russian oligarch ahead of the invasion of Ukraine. In a joint letter to the US envoy in Israel, the Yad Vashem's chairman vouched for Roman Abramovich, saying he is one of its top donors. The letter also said that sanctions on Abramovich would be unfair to the Jewish world. Last month, Israel's Holocaust Memorial Museum, a chief rabbi, and several Israeli charities and organizations asked the US to avoid sanctioning...