I'd say - generally - you're right. Other countries should not have foreign prisons. But, in times of war, sometimes we have to do things a little differently.

>It is the, IMO, completely outrageous idea that one country can have prisoners in another country.
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>I don't know how would it be different in any situation or under any circumstances. If USA having prisoners (and therefore a prison, guards etc) in Egypt or elsewhere is OK, then I figure it's equally OK if Pakistan had a prison in Island, or Russia had a prison in Canada, or if Japan had a prison in Greece.
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>Imagine yourself going to a vacation in Panama, there being kidnapped by secret service of Malaysia and being moved into and then kept in a secret prison in Luxembourg, and nobody would know where you are. And you wouldn't want anyone to talk of your case until more is known.