You can see which country spends money in US politics on OpenSecrets, actually.
Link for 2023 spending: https://www.opensecrets.org/fara?cycle=2023
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Country | 2023 Spending
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Liberia $235,465,089
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Saudi Arabia $93,058,680
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China $85,378,704
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Japan $69,410,221
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Hong Kong $55,957,695
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Bahamas $52,861,943
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Marshall Islands $45,711,184
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United Arab Emirates $40,491,794
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South Korea $30,982,223
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Canada $21,529,601
It’s obviously not impossible, but you’ll find people calling every single private messaging platform honeypots. I don’t recall seeing any convincing proof for Tuta, personally.