Iam a student from sri lanka currently studying in russia, can i apply for visit visa for china from russia ?

Iam a student from sri lanka, and now studying in russia for more than 2 years.I have firends in china, so i want to visit china on next september, but i heard that getting visa for china from sri lanka is little difficult in this season , because of olympic. now iam in sri lanka, but in next month i will go back to russia, so i want to know that, can get chinese visit visa from russia to china and what kind of doents need for that ? , please feel free to answer if you know something about that,