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The wage mentioned in your request sounds like close to real one. Average wage in this field in Kharkov is about 350 USD per month (in 2013) and a lab technician is one of the lowest positions. Paying 200 USD for English lessons sounds too much, I have found a lot of courses for much less.
Also, our usual advice is not to send any help to person in Ukraine before you are absolutely sure that the person is real (you meet the person face to face). All the costs are not so high that can stop someone from meeting you especially if you help afterwards. Otherwise you are doing it on your risk.