Let's just imagine for a moment that the story is true:
Counter-trade for aircraft isn't new. Hawker-Siddeley sold 748s to Aerolineas Argentinas for corned beef long before most people could point to the Falklands on a map.
Most of Russia's wheat used to come from the Ukraine. The yellow in the Ukraine flag represents wheat. Vlad is probably looking for an alternative source. Their beef generally comes from the US and Australia, neither of whom are best friends with Mother Russia at the moment, so they will be looking for an alternative supply for that, too.
The Argies would welcome a (slightly) more modern addition to their geriatric air force from whatever source and they aren't going to get it from any of the usual suspects. (It might also give the western manufacturers an opportunity to sell some new(er) aircraft to their neighbours on the other side of the Andes).
If I were Vladimir Putin, I would see this as a perfect way of extracting some revenge against the UK. Give the bullets (as it were) for someone else to fire and throw up your hands if they're used in the wrong way. Even if they were never used in anger, they would provide a nuisance factor - rather like the Bears which seem to enjoy flying around the edges of NATO airspace...