What Distinguishes Spying from Defending a Country’s National Interests?

Countries spy on each other. This is nothing new. It is a way to keep informed of what enemies (or potential enemies) are doing (or planning to do) against one's interests (including national interests).

Was the opening of the package containing the new Enigma Machine (sent to Germans who were in Poland) part of spying—or—was it part of Poland's need to defend herself against an aggressive neighbor (led by Adolf Hitler)?

What circumstances would justify the post office of one country opening a confidential package being sent to diplomats of another country?

Does a country have the right to defend itself against the aggressions of another country? If so, explain how spying can be a useful tool.

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