Alexander Pushkin is Russia’s national poet, and “Eugene Onegin” is his most resonant masterpiece. It is no easy feat to transfer the life of poetry to the stage, but it was the burden director Rimas Tuminas had to bear in his much-anticipated and much-acclaimed reimagination of Pushkin’s seminal poem. The production, shown in Amherst Cinema, lasts a little under two hundred minutes, and in that time presents a jarringly contorted vision of the world of “Onegin,” one in which regret mangles its chronology.