E-visa: the central MFA rule is medical insurance valid in the Russian Federation for the entire stay, except for nationals exempt on reciprocity grounds. No permitted source opened identifies Singapore as exempt, so do not claim an exemption; an ordinary Singapore e-visa traveller should carry qualifying cover. The MFA FAQ says omitted insurance information in the form is not itself a refusal/entry-denial ground, which is distinct from possessing the required insurance. Regular tourist visa: the Singapore mission lists insurance only for EU citizens for the full Russian stay and does not publish a Singapore-ordinary-passport certificate requirement.