Russian Prime Minister Dmitry Medvedev has reminded to Ukraine and Moldova that they cannot participate in two free trade zones, with the EU and the CIS, simultaneously.

"Problems for constructive work are being created by decisions made by some of our partners, namely, Ukraine and Moldova, to put in place the association agreement with the EU. We have said many times that it is impossible to participate in two free trade zones, with the EU and the CIS," Medvedev told a meeting of the Council of Heads of Government of the CIS Countries on Friday.

Medvedev said "this creates the threat of re-export of goods from third (European) countries under the guise of Ukrainian and Moldovan [goods]."

Medvedev reiterated that certain protective measures have to be taken to eliminate these risks. "Russia already made such a decision on Moldova (on September 1, 2014). On January 1, 2016, the level of the customs and tariff protection will be raised for Ukraine. The zero customs duties will be replaced by the most favored nation treatment for it," Medvedev said.

Medvedev also said that "the economic measures taken by us in response will apply to Ukraine as a country that has joined the anti-Russia sanctions." "It's all being done in accordance with the WTO norms and the CIS Tree Trade Zone Treaty with full observance of the procedures," he said.