Kolomoyskiy and Boholyubov, who are both under investigation by the FBI for money laundering, are suing the US Government for attempting to seize their Texas commercial building worth $23 million, RFE/RL reported in a 1,000 word article from Washington. They say the US government’s actions violate the sovereignty of Ukraine. Last week, Optima Ventures, a U.S. real-estate holding company controlled by the pair, informed a Florida court that it will file for arbitration against the United States in the World Bank’s International Center for Settlement of Investment Disputes.