The Air and Space Defense Forces began deployment of a network of over-the-horizon (OTH) radars, code-named "Kontainer". The first one began "experimental-combat" operations in Kovylkino, Mordovia on 2 December 2013. The radar is reported to have a range of about 3000 km, which allows it to detect aircraft over large part of Europe (the video shows operators looking at air traffic over Denmark).
It is most likely that the OTH radar network is being built to provide a warning against air-breathing targets - aircraft and cruise missiles. I wouldn't be surprised if it is also capable of detecting the kind of glider vehicles that are considered for Prompt Global Strike missions.
UPDATE: Here is the radar on Yandex Maps.
UPDATE 12/09/2013: The station is now reportedly functions "in combat mode".
UPDATE: Jane's reports that the radar has separate transmitter and receiver. Kovylkino is the location of the receiver. Transmitter is located near Gorodets.
The book
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The "Kontainer" OTH radars has also 29B6 designation:
http://bastion-karpenko.ru/container/
This well known book:
http://www.knigapoisk.ru/item/2596435/
...tells us that the "Kontainer" radar was developed by NIIDAR during the Soviet period.
Even the map of the radar's dislocation on the USSR territory was already developed:
http://www.e-reading.co.uk/chapter.php/115295/15/Babakin_-_Bitva_v_ionosfere.html
Modern open sources specify to us that the first 29B6 ("Object 5452") has two positions: Site 1 (Gorodets, Nizhny Novgorod Region) and Site 2 (Kovylkino, Mordovia):
http://sudact.ru/arbitral/doc/XybPtliZK2lP/
Alexander: Thank you very much! It's interesting that the radar can track aircrafts fairly accurately (I think it's at 2:19 in the video).
If only the internet-on-line map from www.flightradar24.com there isn't used. :-))
http://www.flightradar24.com/#55.42,9.08/6?&_suid=138609345133406299075587920486
So this radar can detect cruise missile? What about VLO aircraft?
So how does this differ in design and function from the Voronezh? Is it a continuation of the Duga/Woodpecker?
Alexander: Good point. Doesn't look like it, though - the tracks are not as smooth as in flightradar and the names on the map are in Russian (but, of course, they could project the traffic control data on a Russian map).
As far as I can tell, this radar is different from the Duga line - it is not designed to detect ballistic missiles.
Are the new OTH radars capable of transmitting and receiving targetting data to PVO/VVS assets? Is that even possible in principle? For instance a Kontainer tracking a TLAM and providing firing solutions to Su-35s and/or S-400s.
Pavel,
1) Can adapt flightradar24.com data under the Russian software any if very much wants. :-)
2) No different from the Duga.
Feature of all such OTH radar that it can trace only start-up of ballistic missiles from any territory but not give data on their trajectory.
to Alex:
Yes, it is possible and provided. But not directly aboard the fighter or on a command post of the S-400 division, but through intermediate links of automated control systems.
Report by Krasnaya Zvezda ('The Red Star'):
http://www.redstar.ru/index.php/newspaper/item/13117-zagorizontnyj-ryvok-rossii
Apparently a second one is planned before 2018.
Article from Jane's today, on the transmitter site North of Gorodets:
http://www.janes.com/article/31614/russia-activates-new-long-range-radar