Sweden confirms that a foreign submarine has violated its territorial waters in October

Stockholm increase the tone and branded "unacceptable act for the security of the kingdom while acknowledging not knowing who is responsible."

Supporting photographs, the Chief of Staff stated that it was "a submarine that was small in Swedish waters by observations conducted by military sensors of the Royal Navy Swedish and services information. "

Prime Minister Stefan Löfven reaffirmed that "Sweden did not want such activities in its waters, and that it was disturbing that the authors were taking huge risks." The head of government also said that research capacity and identification of the armed forces would be strengthened.

From 17 to 24 October, Sweden conducted a major operation to find in the Baltic Sea and the Stockholm archipelago, a possible submarine, Russian assumed that after similar incidents during the Cold War and Moscow with a tense backdrop of war in Ukraine.

But Russian authorities have always denied any involvement.

With AFP.