By Natalia Zinets and Max Hunder KYIV (Reuters) – Ukraine pressed ahead on Sunday with efforts to restart grain exports from its Black Sea ports under a deal aimed at easing global food shortages but warned deliveries would suffer if a Russian missile strike on Odesa was a sign of more to come. President Volodymyr Zelenskiy denounced Saturday’s attack as “barbarism” that showed Moscow could not be trusted to implement a deal struck just one day earlier with Turkish and United Nations mediation. The Ukrainian military, quoted by public broadcaster Suspilne, said the Russian missiles did not hit…