It appears US President Donald Trump has not learnt his lessons about economic warfare backfiring. Not once, but twice in the past 12 months — first with China, which leveraged its dominance over rare earth minerals in the trade war, and then with Iran, which effectively weaponised the Strait of Hormuz, holding global energy markets to ransom.Now, a day after ceasefire talks between Iran and the US collapsed in Pakistan, Trump has threatened to deploy another tool from the economic warfare arsenal: a naval blockade.In a Truth Social post on Sunday, Trump said he would “shortly” block all ships passing…