European Union monitors of Russian gas flows have gained full access to control rooms in order to verify shipments to Europe via Ukraine, the European Commission said Tuesday.

European Union monitors of Russian gas flows have gained full access to control rooms in order to verify shipments to Europe via Ukraine, the European Commission said Tuesday.

"As far as the deploying of the observers is concerned, it seems that that has been sorted out," commission spokesman Johannes Laitenberger told journalists in Strasbourg, adding that he was being "very cautious."

The European Commission said earlier that its energy monitors hadn't been given access to all distribution points in Russia and Ukraine to check on the transfers of gas.

The two concerned sites were OAO Gazprom's (GAZP.RS) dispatching center in Moscow, where there are two E.U. observers, and Naftogaz's dispatching center in Kiev, where six E.U. monitors are placed.

In Brussels, commission spokesman for energy issues Ferran Tarradellas said the monitors had since been allowed into the control rooms where the gas flow monitoring screens are located.

"The Russians sent a small quantity of gas this morning at a single point, then the pressure fell and there was nothing after that," he said.

"Not a single molecule of gas has arrived at other entry points, according to our inspectors."

Kiev has said the resumption of gas supplies has been held up by a lack of pressure in the network, the E.U.'s Czech presidency said.

Russia and Ukraine committed Monday to resuming shipments of Russian gas through Ukrainian pipelines to E.U. consumers, but the flow was halted with Russian energy group Gazprom accusing Ukraine of blocking supplies.

"It's a big disappointment, there's no justification for these problems to continue," said Laitenberger. "There's no reason to claim that gas cannot be delivered to the E.U."