"Had it continued for another 12 minutes, the carnage would have been much worse than the four basic cables that were there," Finnish President Alexander Stubb said.

Russia's military on Tuesday said it would retaliate against Ukraine after Kyiv attacked Russian regions by firing six U.S.-made ATACMS ballistic missiles, six UK-made Storm Shadow cruise missiles and launching one of the biggest drone attacks to date.

Finnish investigators say the crew of an oil tanker accused of damaging undersea power and communication cables in the Baltic Sea were preparing to cut additional infrastructure before authorities intervened,