Why the Mercury name could remain unused

Why did the Russian Navy wait so long to reuse the name Mercury?

Political changes and uneven shipbuilding are offered as general explanations, without confirming the prompt's exact interval.

The question claims a gap of roughly 190 years after the sailing ship. Imperial, Soviet and modern Russian governments had different political naming priorities. Periods of limited construction also reduced opportunities to reuse names. Those are general explanations for a long gap; the exact interval and absence of intermediate uses are not verified here.