yea I pinged my router @ 1ms everytime. how ever I pinged server.war2.ru @ a range from 70 - 80 ms.
70-80 ms is not a problem at all. My ping to server is about 130-150 ms and i have no such problems.
Looks like something wrong with your ISP. Maybe not perfect handling for UDP packets or w/e. no idea. You can try to ask your ISP support, but i don't think they will be able to find any solutions.
I'd say the easiest way for you is to try vpn. Maybe to try something cheap ($2 or w/e). Just to test. Should help for you i think.