By Mimosa Spencer CANNES, France (Reuters) – “Mariupolis 2,” a documentary showing a close-up view of life under bombardment in Ukraine, debuted at the Cannes Film Festival Thursday with an emotional tribute to slain director Mantas Kvedaravicius by his fiancée. “It’s an honor to present Mantas’ recent work. It’s great the festival honors his legacy and his work as a filmmaker and anthropologist,” said Hanna Bilobrova, fighting back tears. Kvedaravicius, 45, was killed in April in Mariupol, where he was filming with Bilobrova, who co-directed the project. “We were determined to show it,” said …