Sweden is the 32nd member of NATO, breaking with its traditional neutrality. Around the Baltic Sea, nations are all worried about what Vladimir Putin might do, after showing he is capable of invading his Ukrainian neighbor.

Our reporters Julien Sauvaget and Clovis Casali visited the island of Gotland, considered by experts to be the most strategic place in theBaltic Sea. The island is considered to be one of the most strategically important places in the world, according to experts.