Russia can do basically anything imaginable:

1) destroying all electricity generation: Russia has coordinates of every power plant in Ukraine, just launch missiles and its over. Russia believes Ukraine is governed from abroad, this makes chaos enough to stop that. Russia absolutely does not need to create incident on Zaporizhzhya power plant, as Khmelnitsky and Rivne power plants are in their reach.

2) Russia can bomb every bridge in Ukraine. Kyiv have 5 bridges, 3 road bridges, 1 railroad bridge and 1 combined road and railroad bridge. After doing so illusion of Ukraine winning stops immediately.

3) Russia can bomb Zelensky, Verhovna rada, any government building including military commissariats vhich are in charge of mobilisation, Ukraines Security Service buildings, news agencies, internet hubs, National Bank of Ukraine, anything. Russia does not do this just because Zelensky and parliament are not in charge. After Ukraine bombed Luhansk administation building on 2 june 2014 Ukraine knows two can play that game.

4) Russia can bomb Holodomor memorials, bandera streets and avenues, maidan casualties memorials, just to deliver a message.