Ryanair, Europe’s largest airline, plans to invest $1.5 billion in Ukraine through 2023, increasing passenger traffic to 5 million and its all-Boeing fleet here to 15, David O’Brien, the airline’s Chief Commercial Director, said Tuesday at a meeting with President Poroshenko. The main obstacle to expansion is protectionism from Germany, France, Italy and Belgium, O’Brien said. Later, Infrastructure Minister Volodymyr Omelyan predicted that Ukraine’s “Open Skies” agreement with the EU “will be finally signed in the first half of next year.”