Yes, you are allowed to do an internship in India after completing your MBBS in Russia. However, you will need to meet certain eligibility criteria and follow the guidelines set by the Medical Council of India (MCI) for foreign medical graduates.

To be eligible to do an internship in India, you will need to pass the Foreign Medical Graduates Examination (FMGE) conducted by the National Board of Examinations (NBE). This is a mandatory exam for foreign medical graduates who wish to practice in India. You will also need to fulfill other requirements such as having a valid passport, and visa, and completing the necessary paperwork for registration with the state medical council where you wish to practice.

It is important to note that the rules and regulations related to foreign medical graduates may change from time to time, so it is recommended to check the latest guidelines before planning to pursue an internship in India.