It is a training simulator... there is no need to connect it to the air defence network or any other military network.
They can put trojans and viruses and bugs all through the system... it wont matter.
Most of the software can be rewritten anyway... the Russians have plenty of computer simulation game programmers and they can write the software to suit the hardware being attached to the system.
I rather doubt the Russians will want to share military technical performance data with Germany so they can program the system to accurately simulate the performance of certain hardware.
I think this is a brilliant purchase for Russia that will allow two brigade sized formations train and practise without burning fuel, wearing out tanks, or using expensive new guided ammo. It will allow them to train from individual vehicles or weapon stations (ie manpads and ATGMs teams) right up to armoured units and entire brigades against entire brigades.
Performance can be monitored and checked and recorded for later analysis, and new weapons and command and control systems can be tested without needing the actual hardware in service.
They can develop new hardware and create simulators for it and test it with the simulator for ease of use before a test deployment to check to make sure the users are using it as intended (remember all training is recorded and can be reviewed and analysed).
They can also train on any terrain in any conditions day or night and any weather, without threat of cancellation or frostbite cases.
They can recreate scenarios to test forces to be sent into places like the Caucuses.
Most NATO countries don't have this simulation capability...
...and the US is grumpy about Russia buying 4 helicopter carriers from France!
The point is that once they have bought this simulator it can be used as a model for future Russian designed and made simulators with Russian code, Russian military symbology and Russian hardware.
This system will need replacing or seriously upgrading in 2015 anyway because of the new hardware that will be entering service will require all new hardware simulators developed so that will be a good opportunity to upgrade the electronic hardware and software too.
I am so incredibly jealous that new Russian recruits will get a chance to play the ultimate LAN games, before using the real thing in real exercises.