Highlighting that the Taliban are part of the 'global movement of radical Islam', he pointed out that while the movement contains many different groups, they share the same basic ideology.
Blair conceded that mistakes were made over the past two decades but added that military interventions can be noble in intent, especially when challenging an extreme Islamist threat.
Jaishankar also noted that there was a need to effectively utilise the capabilities spread across the world to deal with the coronavirus pandemic.
Blair's government negotiated the 1998 Good Friday Agreement that ended three decades of bloodshed in Northern Ireland.
After two years of wrangling with her Conservative party, May finally presented her plan this month for economic ties with the EU after Brexit, sparking outrage among hardliners in the party.