Is salaries to Indian residents working in the Russian Embassy in India included/excluded in domestic income of India?

No,

salaries to Indian residents working in the Russian Embassy in India will not be included in the domestic factor income as the Russian Embassy is not a part of the domestic territory of India.

Explanation:-

Only Profits earned within the domestic territory of India by residents and non-residents are included in the domestic territory of India.

As the Russian Embassy does not lie in the domestic territory of India, the salary received by Indian residents will not be included.

But, his profits would be included in the National Income as factor income from abroad.