Last year, energy infrastructures were attacked.
This kind of attacks usually are associated to casu belli, that is an event bad enough to trigger a war.
Disclaimer: it is not about determining who dunnit, pointless. Motives do not equate with guiltiness. That reminded, a few observations are mandatory.
The list of suspects amounts to four.
Russia: Russia is at war and aggressive to the West. They may have plotted it. Their motive is unclear and could in fact be a master piece (more about this later)
US and Norway: could have done it, motive: trade, the attack was an opportunity to kick out competition (Russia) in the teeth to make room for US and Norway's products.
Poland: could have done it, motive: trade. Poland is unhappy with the influence Russia gets out of their trading deals and could have seized the opportunity to diminish said influence.
Ukraine: could have done it, motive: trade. Similar to Poland, Russia's influence got through trade deals influenced European countries in not supporting enough.
Out of four suspects, three come from the side of good, three of them are allied in some sort of ways to the countries that endured the consequences of the attacks.
The mobile is trade and exists in time of peace as war as well.
World peace is going to be a joy to behold once the world has grown liberal.
If Russia did it, it is a masterpiece as it revealed mobiles amongst to attack each other among countries that claim to be on the same side.