Before committing yourself to any travel medical insurance it is worth checking the conditions of the insurance coverage to make sure that it is appropriate travel insurance for Russia, such things to pay attention to include:
The larger medical centers in Russia have billing arrangements with various international travel insurance companies. These arrangements allow them to deal directly with travel insurance companies so medical bills and claims can be settled on your behalf.
Travel insurance policies vary and so do their prices, it's always worth getting travel insurance cover quotes from different companies before deciding or renewing. Many travel medical insurance companies offer instant online insurance quotations.