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Surely the point of a hoax is for it to be funny, no? Where's the joke in this?
1) It pokes fun at the British by boasting about a new and powerful ally
2) creates disinformation which has to be considered at high level - possibly divert funds
3) keeps on-message about retaking the Malvinas (and forgetting domestic issues).
4) Ingratiates yourself to your new powerful best friend by creating mischief for the British in retaliation for their meddling over Ukraine
What could be funnier?