Aeroflot has increased fine for return tickets purchased at special rates. The increased fee for return tickets will be taken from August, 1st 2010. The charge for domestic flights varies from 500 to 900 Roubles (appr. £20) and from 15 to 25 Euros on international flights.
If a passenger returns tickets within 24 hours before the departure, an additional charge of 25% applies.
It looks like Aeroflot is trying to level Russian legislation which claims possibility of return any tickets.