A year ago, while much of the world remained on lockdown, Willem Dafoe got to work. As film productions gradually started back up, the veteran actor was ready for them. The result is that the ever-versatile performer has a wide range of projects in the pipeline, from “The Northman” (Robert Eggers’ follow-up to “The Lighthouse”) to Guillermo del Toro’s “Nightmare Alley.” But one movie just released in theaters has been waiting for its moment since the early days of the pandemic: “Siberia,” his latest collaboration with cinematic provocateur Abel Ferrara, premiered in competition at the 2020 Berlin Film Festival shortly before lockdowns spread throughout the globe.