UKRAINE’S ECONOMY is sputtering and Russian troops are massed on the country’s eastern border, but during a recent visit to the Black Sea port city of Odessa, I discovered dogged hope for the future. “We came here sensing opportunity,” said Vlad Davidzon, whom I encountered at Dizyngoff, a new Israeli-French-Asian fusion restaurant. As worldly as the restaurant, Mr. Davidzon, 32, born in Uzbekistan and bred in New York, holds passports from three different countries. Several years ago, he and his wife, Regina, moved to the Ukrainian city from Paris to found the Odessa Review, an English-language arts magazine. They were...