Israel’s official Holocaust museum has urged the US not to sanction Roman Abramovich ahead of Vladimir Putin’s invasion of Ukraine because the Russian oligarch was one of their biggest donors. Chairman of the Yad Vashem museum Dani Dayan signed a joint letter – dated February 6 – to Tom Nides, the US ambassador to Israel, calling for the billionaire to be excluded from financial punishments amid threats of a planned Russian attack on Ukraine. Abramovich, who was born into a Jewish family and amassed a fortune of $12.4 billion largely by selling previously Russian state-owned assets, was the mu…