Sending proceeds from frozen Russian assets to Ukraine is illegal, the Russian Foreign Ministry said in a statement.
"Although the frozen assets themselves are not being confiscated, Brussels' use of the proceeds... is an illegal act... Both the freezing of Russian assets and any subsequent actions with them are absolutely illegal," the ministry said.
It said the practice of freezing assets cannot but affect the attitude toward the euro as a reserve currency.
Moscow will respond to the West freezing its assets, the Russian Foreign Ministry assured.
"Retaliatory measures will certainly follow. They will be balanced, verified and will not cause damage to Russian economic operators. We have a sufficient arsenal of appropriate political and economic steps against those who are trying to 'lay their hands' on Russian gold and foreign currency reserves," the ministry said.
Financial injections into Kiev contribute to the escalation of the Ukrainian conflict, the ministry added.
"Financial injections into the military machine of the Kiev regime are pushing [President Volodymyr] Zelenskyy's junta to more adventures and contribute to the escalation of the conflict, excluding the possibility of a political and diplomatic settlement," the ministry said.