The Finnish documentary The Helsinki Effect, premieres in national cinemas on April 11.

In the summer of 1975, world leaders from East and West met in Helsinki to discuss security and cooperation during the Cold War. Through hundreds of hours of archival footage and newly declassified transcripts of high-level conversations, director Arthur Franck uncovers how the Helsinki conference came to have a profound impact on the world – and how it resonates in today's troubled world, 50 years later.