At a roundtable discussing the lessons of the Chornobyl disaster of 1986 (from left) are: Nadia McConnell, president of the U.S.-Ukraine Foundation, Ambassador Valeriy Chaly, Ukraine’s envoy to the U.S. and Mykola Riabchuk, a prominent Ukrainian writer. WASHINGTON – A roundtable discussion commemorating the 30th anniversary of the Chornobyl nuclear disaster was held at the...