The Swedish prime minister has said that his country is neither at war nor at peace as he announced that Sweden would be sending armed forces into the Baltic Sea for the first time as part of increased surveillance efforts amid a spate of suspected sabotage of undersea cables.

The country announced it will contribute up to three warships and a surveillance aircraft to a Nato effort to monitor critical infrastructure and Russia’s “shadow fleet” as the alliance tries to guard against sabotage of underwater infrastructure.