According to the author of the material, Russian specialists have in-depth knowledge of the thermal system developed during the Soviet era.
That is why, Nugent writes, for Ukraine, its energy system has become a weak spot.
Earlier, Ukrenergo said that the attacks on Ukraine's infrastructure on October 22 may have caused more damage than previous attacks.
The deputy chairman of the Kyiv administration, Pyotr Panteleev, said that this winter Kyiv could be left without heat, heating could be turned off for several days or weeks.