BUCHAREST - Nato member Romania announced on Tuesday that it has begun building air-raid shelters for residents near the Ukraine border, after drone fragments were found there last week. Moscow has ramped up attacks on Ukraine’s southern Odesa and Mykolaiv regions, home to ports and infrastructure vital for agriculture exports following the collapse of a deal allowing grain shipments from Black Sea ports. Since Russia’s all-out invasion of Ukraine in February last year, Nato has been focused on preventing the war from spilling over onto its territory