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There are also numerous instances of their intelligence forces spying on us, an ally.

Everyone spies on everyone, no one is actually shocked by that. The US does it too (see the interception of Angela Merkel's phone calls...)

The key is you don't get caught doing it, because it removes plausible deniability.

The important detail is to not get caught publicly, generally nobody will raise a stink if western counterintel catches spies from a friendly state.