This is a part answer to your question
According to the website The Cod Wars (Britains-smallwars.com),there were actually 3 Cod wars, involving some shots being fired and in particular, ramming of boats - one nasty one in particular prompted some response from various groups around the world, according to the website:
- The Nordic Union came out in support of Iceland
(There is a precedent that may be a reason why, that in the 1930's, Britain took Norway to the international Court of Justice which ruled in Norway's favour according to The National Archives 'Cod Wars' page)
- With the threat of shutting down a key NATO station, which according to the website, NATO and the US took a mediation role - where NATO as a whole stopped the conflict.
According to the article "”There’s Something Wrong With Our Bloody Fish Today”
Wargaming the “Cod Wars”" (Manley), West Germany (and other fishing fleets frequenting the area - from the Faroe Islands and Belgium), where the 3rd Cod War,
the Royal Navy fought to defend the interests of fishermen from several European nations as well as those of
But these articles do not mention any particular action or response from Spain, nor do any suggest direct involvement of other naval fleets, other than the fishing vessels from those listed above being harrassed by Icelandic Coast Guard ships (until they made their governments made agreements with Iceland).