Why US labelling Khalistani Harpreet Singh, aka Happy Passia as part of 'foreign terrorist gang' matters

In a major boost to India-US counter-terrorism ties, the FBI has arrested Harpreet Singh, alias Happy Passia, a key figure in a series of Khalistani-linked terror attacks in Punjab. With the US formally designating him part of a foreign terrorist gang, is this the beginning of a global shift against extremist networks operating from Western soil?

Explainers