If you are only traveling in summer vacation, you can choose to take the train to Harbin, and then take the bus to Suifenhe.
There are many such short-term Russian classes in Suifenhe. You can try to take a beginner's class.
Of course, if there is only one summer vacation, you may not learn all the letters.
If you haven't left yet, think again. You can go to a nearby city.
Because it's too far away, traveling alone will be very tiring, and you can only solve the problem by yourself.
Of course, what you think is the most important is up to you. These are all opinions.