"One of the estimates which we managed to learn, the Russian internal estimates, is that Western sanctions ... forced the Russian budget to lose $173bn already, which is quite a lot," Yehor Bozhok, the Head of Ukraine’s Foreign Intelligence Service, said.
"This is their (Russia's, - ed.) internal assessment, which they prefer not to make public," he added.
The figure covered the period from 2014 to the end of 2018.
The EU and the U.S. sanctioned Russia after it annexed Crimea. The sanctions expire on July 31 if the EU states do not renew them by consensus.
Russia, in its turn, denies being at war with Ukraine, having informed that the sanctions do not have any effect on its economy.
Crimea was annexed by Russia after the illegal referendum held on the peninsula in March 2014. Earlier, the Russian military captured all strategic military objects and buildings of the key authoritative bodies. Neither Ukraine nor the rest of the civilized countries recognized the results of the referendum. A number of the European and the world countries, including Ukraine, imposed the economic sanctions against Russia.