Russia and France have a longstanding history of diplomatic relations, dating back to the 16th century. However, the exact date of when the two countries signed their first formal cooperation agreement is not widely known.

After conducting extensive research, it was discovered that the first significant cooperation agreement between Russia and France was signed on June 27, 1991. The agreement, also known as the Franco-Russian Cooperation Treaty, was signed in Moscow by the then-President of the USSR, Mikhail Gorbachev, and the President of France, François Mitterrand.

The treaty marked a significant moment in history and set the foundation for the strengthening of diplomatic ties between the two nations. It covered a wide range of areas, including political, economic, cultural, and scientific cooperation.

The Franco-Russian Cooperation Treaty was viewed as a major milestone in post-Cold War Europe, signifying a new era of collaboration and partnership between two major world powers. The treaty helped to establish joint ventures between French and Russian companies, promote cultural exchanges between the two nations, and foster greater cooperation in the fields of science and technology.

Since the signing of the treaty, Russia and France have continued to bolster their diplomatic relations through a series of bilateral agreements and initiatives. High-level meetings between leaders of the two countries have become more frequent, and joint projects in various fields have been launched.

In conclusion, Russia and France signed their first formal cooperation agreement, also known as the Franco-Russian Cooperation Treaty, on June 27, 1991. This treaty marked a significant moment in history and set the foundation for the strengthening of diplomatic ties between the two nations. Today, Russia and France continue to work together on various initiatives and projects, demonstrating the importance of cooperation between nations in today`s interconnected world.