I see 2 reasons for this:
1. To stop youth from going abroad (brain-drain)
2. The state companies that are going bankrupt need young labor force. So the government forces graduates to work there. The state enterprises (plants, factories etc.) are financially supported by goverment (actually by the taxpayers). If they close large plants (even those that don't bring any profit) a lot of elderly people will lose their jobs and there will be a chaos. So they continue to support unprofitable state companies.
Among the workers of belarusian state plants and factories there are a lot of people who are over 50 (I think 70 - 80 %). But there are very few young specialists.
Another interesting thing:
If you graduated from Pedagogical University, for example, you'll have to work at a school in a village and, perhaps, in Chernobyl area because nobody wants to work there. But a lot of people still live there and they need to be educated.