“The (Rostransnadzor) commissions have established that the main causes of accidents are non—compliance by ship captains and shipowners with restrictions on the season of navigation of vessels in the sea areas of the Sea of Azov and the Kerch Strait,” the Ministry of Transport reports.

But in a dysfunctional state like Russia laws are impossible to abide for everyone. It’s just that they are enforced only when those in power have interest to do so. See https://en.wikipedia.org/wiki/Law_of_the_Soviet_Union