Aye, HMS Sheffield, Atlantic Conveyor and damage to HMS Glamorgan. The French, to their credit, did help us limit the threat of more attacks.Argentina was ruled by right wing military dictatorship, and like all right wing dictatorships in South America (like Pinochet in Chile), they were supported by CIA. USA had a lot of links with Argentina and they actively tried to stop the war, but they were forced to choose the side after the start.
So yeah, Soviets didn't had much ideological ties with Argentina, beside more pragmatic "enemy of my enemy is my friend". I think biggest danger for you were French provided Exocet anti-ship missiles, you lost few warships if i recall correctly.
The Argentinians did accept some intelligence from the Soviets, which mainly constituted satellite imagery and surveillance of the task force and Ascension.
When the US found out, they were quite displeased.
