If she writes or talks too much about financial issues, problems and troubles, she might be a scammer.
So, limit things to gifts or gift certificates, if you are not sure what to send over. She is out there looking for a husband, not a distant lover.
They have good internet connection, so there should be no problem doing video conversations with her. Check out if your dating site offers such services.
Even if she does not know English, you may still want to get on Skype. Handle the situation as you would with ladies from any other place. They may send some flowers or a gift over to her and you pay for it.
Better get a good interpreter and pay for your communications.
Two or three letters is enough to ask to meet with the other person on Skype. Once you spend several chats on Skype and write back and forth to each other, you may take it a bit further.
If she is not willing to do that you might be dealing with a scammer. If you really like the lady, you may offer her to date you. If you two take strongly to each other, why not start playing solo? This means you should be making some sorts of plans for the future.
These days most people in Russia have PCs, phones, etc. You see, you start writing to several people at once. You may plan a trip to Russia to come and actually meet in person. Distant dating should not mean your lady is not getting any presents or flowers.
There are hundreds of various dating sites, where you can meet Russian girls. There have been many cases when people would date “fake” brides from Russia.
Do not forget you have a language barrier to deal with.