Christopher Vourlias When he began working on his sophomore documentary feature, “Iron Butterflies,” in 2019, Ukrainian filmmaker Roman Liubyi said he was “making the film as a warning, before the Third World War.” The film, which world premiered at Sundance, follows the Russian disinformation campaign surrounding the downing of Malaysian Airlines flight MH17 in Ukraine in 2014, a tragedy that was determined by a Dutch court in Nov. 2022 to have been caused by a missile supplied by the Russian military to separatists in Eastern Ukraine. Many Ukrainians thought the tragic event, which killed 289 civilian passengers and crew, would serve as a wake-up call to Europe and the U.S., which had largely turned a blind eye to Russia’s meddling in the region, said the director. But the years dragged on and the long-running conflict in Donbas retreated from the headlines — until an increasingly emboldened Vladimir Putin launched a full-scale assault on Ukraine last year.