Look at the specific school. Some schools need to write papers in Chinese, while others need to write papers in Russian.

It depends on the specific professional direction. Some are limited to the linguistic direction, some can write casually, and anything related to the cultural life of Russian-speaking countries can do. Translation direction is also acceptable.

The format of undergraduate graduation thesis is greater than the content. Not difficult. Generally speaking, as long as you follow the requirements, there is no difficulty.

I hope I can help you. If you still don't understand anything, just ask and hope to adopt it.