The honest answer for Ivanovo starts before any question of medical cover: many governments currently advise against all travel to Russia, and that advisory changes the entire insurance picture rather than just adding risk to it. Ivanovo sits roughly 300 kilometers northeast of Moscow in Russia's Golden Ring region, historically promoted as a heritage tourism circuit of old provincial towns, and whatever the city itself offers on paper, the practical reality right now is access and coverage rather than anything specific to this particular destination.
Most standard travel insurance policies explicitly exclude countries under a do-not-travel advisory, which means a policy purchased for a Russia trip may not actually pay out even if you hold one, regardless of what happens once you arrive. This is not an Ivanovo-specific risk; it applies to travel anywhere in the country under current conditions, and it is the single most important thing to confirm before assuming any coverage exists, rather than treating the purchase of a policy as proof that a claim will be honored.
Flight access into and around Russia has also been substantially disrupted, with many international routes suspended or rerouted through third countries, and international card networks and banking services that travelers normally rely on abroad are limited or unavailable in practice. Consular support from many home countries is also reduced given current diplomatic conditions, which affects how much practical help is available if something does go wrong during a trip, medical or otherwise.
Before assuming any policy applies, check your own government's current travel advisory for Russia and read your insurer's advisory-exclusion clause directly, since the wording varies by provider and changes as advisories are updated. If your government advises against travel, most standard travel insurance will not respond to a claim arising from that trip, no matter how quiet or historic a city like Ivanovo might otherwise seem, and no matter how the individual visit itself unfolds.