Compliance requirements for investing in US markets

Hello,

I recently moved back to India and will be a tax resident of India this year. However, I had made some investments in the US/China stock market before moving back to India. A couple of questions

1. Are there any declarations that i need to make?

2. Also, these investments were made using a non-Indian platform, do i need to exit my investments from that platform?  

3. If i continue my investments, do i need to make any declarations every year in my returns?