Ruhl noted that due to the construction of Nord Stream 2, Europe remains "highly dependent" on Russian gas.
According to him, the new gas pipeline also endangers the economic, energy and national security of Central and Eastern Europe, in particular Ukraine and Poland.
"Since Russia will soon be able to punish Ukraine by limiting gas transit through it and thereby not affecting the interests of its important Western European clients, the EU's desire to act as an intermediary will diminish," Ruhl wrote.
As it is emphasized, in connection with the future significant reduction in the transit of Russian gas, Kiev risks not only economic losses, but also depriving itself of access to a vital source of energy.
Earlier, the general director of LLC GTS Operator of Ukraine, Serhiy Makogon, said that Kiev would appeal the decision to certify the Nord Stream 2 gas pipeline if it is made in 2021.