How do you handle India team performance issues on live projects

Need advice on something I have been struggling with.

One of our India devs is underperforming on a live client project. The client has not complained yet, but I can see the quality issues building up. Normal managerial options feel harder at a distance.

What I am trying to figure out:

• How direct can I be in written feedback without it landing too harshly, given the cultural context?
• Should I fly out and have the conversation in person or do it on video?
• Is a PIP the right move, or does that feel overly formal for the situation?
• If it does not improve, how do I manage the exit, given proper employment obligations?

The employment side is handled through Wisemonk, so I have a structured process to follow if it comes to termination. But I am trying to avoid that outcome.

Has anyone navigated a similar situation? What actually worked?