ut anybody with half a brain knows that when you need to trade with capitalist nations for things like...oil, vegetables and fruits...you need to have a profit and surplus oriented economic arrangement...which will invariably lead to exploitation
I'm not sure you know what you're talking about. To have imports you need to have exports. Greece would export vegetable and fruit (or tourist services) and import things like oil. Depending on the economy's state and on the need to not have a trade deficit -this is what's actually important- Greece might have to import less cars. Fine, more people would take the bus.
If that's our problem, than the improvement compared to today would be huge.
No. There would be capitalists. You would need to create surplus value in order to trade.
What? So olive oil from state farms and tourism services in hotels operated by the workers' state can't be traded? Why?
...We shall never recognise equality with the peasant profiteer, just as we do not recognise “equality” between the exploiter and the exploited, between the sated and the hungry, nor the “freedom” for the former to rob the latter. And those educated people who refuse to recognise this difference we shall treat as whiteguards, even though they may call themselves democrats, socialists, internationalists, Kautskys, Chernovs, or Martovs.
V.I. Lenin