What is a reliable source to find out how does the cuban qovernment
finances its trading with the world? We know that its credit rating is
almost zero, finances institutes  and groups that are dealing with the
us market are unwilling to deal with cuban government.

A curious one that
- I have memories of the trading figures between the USSR and Cuma in the 1970s
- they were odd - Cuba exported $1m and imported $100m

Not that long ago Cuba played some trick with using $US as currency
- at the time I reckoned it was an attempt to grab locally held paper

I've a hunch that links between Cuba and Spain are rather a lot
stronger (and older) than one might expect.

On balance Cuba is not that much of a nest of vipers, Castro was quite
smart when he unleashed the prison population on Miami - and it is
rather likely that they are still playing the same trick.

For what it is worth, ie: very little, now is the time for the USA to
turn on a 'charm offensive' to Cuba - my approach would be massive
funding for their medical schools - with bursaries for S. American
students.

I've also got a suspicion that the US is not that unfriendly towards
Cuba, but both parties are playing out a rather well orchestrated
charade.