Sushi has long been a popular indulgence in Ukraine. For the residents of Sloviansk, a city in Russian cross hairs, it can provide a sense of normalcy that is akin to a necessity in wartime.Sushi has long been a popular indulgence in Ukraine. For the residents of Sloviansk, a city in Russian cross hairs, it can provide a sense of normalcy that is akin to a necessity in wartime.