Lately I've been listening to a lot of Russian metal bands. Plenty of thrash, black metal, and old school metal.
Excellent stuff, especially when the bands sing in Russian. Here they are in case you're curious: Both Russian and English as well as genre:

Д.И.В.- D.I.V. - thrash
Коррозия Металла - Korroziya Metalla - thrash
Shah - thrash
Чёрный Обелиск - Black Obelisk - thrash
Железный Поток - Iron Thread - thrash
Аспид - Aspid - thrash
ДАЙ - D.A.I. - thrash
Hellraiser - thrash
Мастер - Master - thrash/speed
Branikald - black
Raven Dark - black
Forest - black
Nitberg - black
Vargleide - black
Walknut - black
Kruger - death
Холостой Выстрел - Blank Shot - death/thrash
Graveside - death
Электро-Судорожная Терапия - Electro Cramping Therapy - speed/heavy
Ария - Aria - heavy
Круиз - Cruise - heavy

Yeah, Walknut is great! I'd also add Station Dysthymia, Below The Sun and Grey Heaven Fall to this list. The first two play some top notch doom metal with a bit of post-metal (Envoy) and psychodelia (Overhead, Without Any Fuss, The Stars Were Going Out). GHF is known for playing an amazing black metal.

http://www.metalstorm.net/forum/topic.php?topic_id=15370

Continue talking here, old thread hasn't been touched in four years.

And Hooray Paz for mentioning Station D.

Scald Scald Scald Scaaaaaald

Forest Stream too.