It was Hong Kong's Information Center for Chinese Human Right and Democracy Movement which said that these exercises are for potential intervention in Korean Peninsula.
Ping!
If China attacks North Korea, the Russians will be there to assist them. Russia has increased it's military presense in the region, specifically in the area of Vladvostok and the Russian/North Korean border. It would be the first use of the SCO as a Military alliance.
I read something about the Russians also moving troops into the Far East Region (Vladivostok) a few weeks back. It could be that the SCO is getting ready to prove its viability as an alliance.
ping
Interesting... Shenyang is where there is a North Korean consulate and Nork hotel to house North Korean hackers, according other articles posted here.
And this is interesting:
A N. Korean Diplomat Found Dead in Shenyang (Disappeared since Oct.) Chosun Ilbo ^ | 11/13/09 | Choi Yushik Posted by TigerLikesRooster