New Delhi, Feb. 20 -- Iran's nuclear programme is back in the spotlight as US President Donald Trump has made it clear that he wants Tehran to stop enriching its uranium stockpile to weapons-grade. Trump has put Iran's nuclear programme as the biggest bargaining chip for Iran to avoid a US military strike there.

Iran, so far, has refused to end its nuclear programme, which Tehran insists is for peaceful purposes, but has expressed openness to some concessions to address the US concerns.

The threat of a military strike is the latest US attempt to prevent Iran from acquiring nuclear weapons. In the past, the US has tried to derail Iran's nuclear programme using sanctions and various covert operations.

The most notable such operation was ...