C Raja Mohan writes: Old Delhi, new Washington

Making sense of US President Donald Trump's latest move — sending "tariff letters" to countries including long-standing Asian allies like Japan and South Korea — requires understanding the profound internal changes in America and their impact on the global order. Some interpret Trump's actions as mere pressure tactics against trade partners. Others argue it was never realistic for Washington to negotiate separate trade agreements with every country. Trump has repeatedly said he would unilaterally set tariffs for most nations while striking deals selectively. As this column goes to press, India is in the second category and might see an interim…