TAP has a odd sale from Lisbon to Moscow with Business Class cheaper than Economy.
TAP flies this route with an Airbus 320 which are equipped with Eurobusiness seats (just a blocked middle) on flights that are over 5 hours long. So the affordable price might be due to the lackluster and back-breaking seat. Add in the usual concerns about TAP so think of this as a Mileage Run first and foremost. This fare books into TAP J Class which credits at 200% to most Star Alliance programs or 9748 miles.