In the aftermath of the US and the NATO withdrawing its troops from Afghanistan, India will have tremendous concern on the resurgence of the Taliban and its territory being used as a safe haven for terrorist, experts said. US President Joe Biden on Wednesday announced that all American troops would be withdrawn from Afghanistan by September 11 this year, thus bringing to end the country's longest war, spanning across two decades. Following suit, the North Atlantic Treaty Organization will also pull out its troops from the war-torn country. "Regional countries, especially India, will have tremendous concerns about the US pullout from Afghanistan and the likelihood of a Taliban resurgence in the country, Lisa Curtis, who was Deputy Assistant to the President and NSC Senior Director for South and Central Asia from 2017-2021 under the previous Donald Trump administration told PTI.