NEW DELHI (AP) — Ties between India and the U.S. had never looked better than they did in June, when President Joe Biden honored Prime Minister Narendra Modi with a pomp-filled state visit. The relationship was among the most consequential in the world and “more dynamic than at any time in history,” Biden declared as he stood next to Modi at a press conference.

Those ties could now face their biggest test in recent years, after U.S. prosecutors this week accused an Indian official of directing a plot to assassinate a prominent Sikh separatist leader living in New York City.