How much could Trump's 'economic D-Day' hurt Iran?

What happened

Iran has so far proved adept at finding ways around years of already punishing sanctions on its economy

Why this counts

What makes this worth tracking, according to BBC, is the chain of decisions it may trigger.

What precedes this

BBC notes that this did not emerge in isolation; pressures have been building around much.

Where this fits in Signal Ledger

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The lens

Signal Ledger reads this through the lens of much, trump, economic, day, hurt: Iran has so far proved adept at finding ways around years of already punishing sanctions on its economy.