Amid the icy climate of the Cold War, in the summer of 1975, leaders from 35 countries—both from the socialist bloc and the capitalist world—gathered in Helsinki to sign what, at first glance, seemed like just another diplomatic agreement: the Final Act of the Conference on Security and Cooperation in Europe (CSCE). What no one anticipated was that this document—whose content appeared harmless and largely symbolic—would mark the beginning of the end of Soviet control in Eastern Europe.

The documentary The Helsinki Effect, by Finnish filmmaker Arthur Franck, offers a fresh, critical, and ironic look at one of the most underestimated diplomatic events of the 20th century. With a conversational narrative and a creative use of artificial intelligence to revive the voices of figures like Leonid Brezhnev and Henry Kissinger, Franck does the unthinkable: he makes an endless parade of speeches and stone-faced conference rooms genuinely entertaining.

The film not only reconstructs the historical context but also reveals the true intentions of the key players involved. Brezhnev promoted the conference with the goal of securing recognition of post-World War II borders, thereby legitimizing Soviet influence over Eastern Europe. The Europeans, for their part, accepted this premise but insisted on a condition: the agreement must include a commitment to human rights, freedom of the press, and freedom of movement. This was the infamous “Basket 3”—the most controversial part, and the one the Kremlin viewed as a direct threat to its internal affairs.

The irony—and the fascination—lies in the fact that Brezhnev agreed. Perhaps due to pressure, perhaps out of vanity. In recovered footage, he appears overjoyed after signing the agreement, unaware that he had just, inadvertently, authorized a tool that dissident movements across the USSR, the Baltic states, and Eastern Europe would use to demand freedoms long denied to them.

Franck’s work goes far beyond historical documentation: it invites us to reflect on the power of diplomacy, even when it seems slow and tedious. Through declassified archives and dramatized recreations, the director takes us behind the scenes of international politics, where even the smallest gestures can have colossal consequences.

One of the documentary’s greatest strengths is its irreverent tone. Franck doesn’t shy away from admitting that, when he started the project, he feared the subject might be “boring.” Yet instead of falling into indifference, the result is a dynamic piece that, with wit and sharpness, connects the past with today’s geopolitical tensions. The ongoing relevance of the Helsinki Effect is evident, for instance, in the current role of the OSCE—an organization born from this very conference—which has publicly condemned acts such as Russia’s annexation of Ukrainian territories.