Key rules
Russia
A DMS policy is required for a patent for its whole term (Art. 13.3 of Federal Law No. 115-FZ). The price and the set of services depend on the insurance company and the region. EAEU citizens who work under an employment contract usually get a compulsory health insurance policy (полис ОМС, OMS), but the employer may also require DMS.
Sources: Federal Law No. 115-FZ on the Legal Status of Foreign Citizens («О правовом положении иностранных граждан»), ConsultantPlus, Bank of Russia: insurance («Банк России: страхование»)