A man found dead in a marsh off Long Island Sound has been identified as Nikolay Papp, an artist from Fairfield who painted a landscape of sunflowers that President Clinton presented to the president of Ukraine as a gift in 1994. On Sunday, police identified the body, which was found Saturday morning in the Ash Creek marsh in Fairfield. Authorities said Papp appeared to have drowned. They do not suspect foul play, but they are awaiting the results of an autopsy. Papp, 59, was from Ukraine and immigrated to the United States in 1990, according to a biography posted online.