“Due to the actions of the American side, participation in the session of the committee of the Russian delegation from the capital was actually disrupted,” RIA Novosti quotes the diplomat.

The head of the delegation, director of the information and press department of the Russian Foreign Ministry, Maria Zakharova, "received a visa just yesterday afternoon."

“The other two experts don’t have visas at all yet,” Polyansky said.

Visa requests were submitted well in advance, he stressed.

Moscow considers this practice unacceptable and urges the UN Secretariat not to allow this in the future, Polyansky added.