Brijuni islands are seen in the Adriatic Sea, Croatia May 28, 2015. When Croatia announced in 2013 it would set a tender to explore for oil and gas in its pristine Adriatic waters, the government evoked the hydrocarbon riches of Norway to win over the plan's many detractors. Prime Minister Zoran Milanovic in April, defended an effort he hopes could help turn around Croatia's economic fortunes after six years of recession. He was responding to public concerns that the project is a high-risk gambl