Sanctioning Iran: Will it work?

It seems that US has just dropped the other shoe now by banning those countries still importing Iranian oil from doing so after early May.

Sophocles in his tragedy Antigone has the line “evil[folly] appears as good in the minds of those whom god leads to destruction”. First came the US unilateral exit from the historical Joint Comprehensive Plan of Action (JCPOA without the consent from our European allies with the resulting division between the US and Europe regarding policies towards Iran. US also restored sanctions against Iran but gave some time for energy-needy allies to import energy from Iran against a deadline. Some like Japan have complied grudgingly with the US orders. Others, particularly China and India have gone on importing Iranian energy.