Cables connecting Finland with Germany, and Lithuania with Sweden, have been disrupted, just weeks after the United States warned that it had detected increased Russian military activity around key undersea cables.

Two undersea telecommunications cables in the Baltic Sea have been severed in recent days, including one connecting Finland to Germany and one linking Sweden to Lithuania.

German and Finland have expressed deep concern over the discovery of a severed undersea cable between the countries through the Baltic Sea

The severing of two undersea fibre-optic communications cables in the Baltic Sea must be seen as an act of sabotage, although it is still unclear who is responsible, German Defence minister Boris Pistorius said on Tuesday.

Two undersea cables in the Baltic Sea were cut, with at least one physically damaged. A cable between Lithuania and Sweden was cut on Sunday morning. The second disrupted cable, about 60 to 65 miles from the first,

Andrius Šemeškevičius, the chief technology officer of Lithuanian telecommunications company Telia, stated the cable was cut on Nov. 17, around 10 a.m. “The systems immediately reported that we lost the connection,

Germany cites Russia's war against Ukraine and the threat of "hybrid warfare" - as Finnish authorities say it could take two weeks to fix the outage.

And last year, Finnish authorities investigated a Chinese ship named NewNew Polar Bear after it was suspected of deliberately damaging submarine cables in the Baltic Sea. According to Samuli Bergström, a director of Finland's National Cyber Security Center, however, “it is certainly possible” the cable broke on its own.