By Andrii Pryimachenko KYIV (Reuters) – A leading Ukrainian ballet dancer who died this week fighting on the frontline of his country’s war against Russian invaders was honoured with a memorial service in the National Opera of Ukraine on Saturday. The National Opera described Oleksandr Shapoval as a “courageous romantic” and brave warrior who died under Russian mortar shelling in the eastern Ukraine on Sept. 12 Mourners, including soldiers from Shapoval’s unit, honour guards and members of the artistic community of Kyiv, crowded the lobby of the opera house, laying flowers on his coffin before…