UPDATE | Finland and Estonia on Friday have agreed to increase the security of their subsea infrastructure, which includes power and telecommunications cables as well as the Balticconnector gas pipeline that was damaged a year ago.

The agreement, announced in Helsinki on Friday, will see the two countries join forces to on things like technical surveillance, patrolling and repair capacities of subsea infrastructure in the Baltic.

It comes amid what Tallin and Helsinki say has been an increased number of threats against subsea infrastructure, and as countries around the Baltic rim are looking to expand all manner of subsea connections.

Finnish police continue to investigate cause of the Balticconnector damage, while Estonian police are looking into damage to subsea telecommunications links that occurred around the same time. Police in both countries have yet to provide their conclusions.