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"We are now seeing the constant violation of the Minsk agreements. We see not only the violation of the ceasefire, but an absolutely cynical decision to recognize fake documents of the fake republics," he said at a meeting with EU Commissioner for Humanitarian Aid and Crisis Management Christos Stylianides.

Read alsoOSCE condemns Russia's recognition of "DPR/LPR" passportsUnder international law, this is an element of the recognition of these illegal groups and the de-facto denial of the Minsk process, he said.

"We consider it to be a very worrying phenomenon and it requires decisive action – up to the strengthening of sanctions," he said.

As UNIAN reported earlier, Russian President Vladimir Putin on February 18 legalized the use of "DPR/LPR"-issued passports and other identity documents, namely birth, marriage/divorce certificates, car registration plates, in Russia. Putin's decree stipulates that the "DPR/LPR" documents are supposedly recognized temporarily until the situation in Donbas has been settled.

Earlier, the RBC media outlet found out that the holders of the "DPR/LPR" passports could also use services of Russian railways, airlines, and hotels.

Ukrainian authorities, including Ukrainian President Petro Poroshenko, sharply criticized the decision, saying it had violated the Minsk peace accords.