On Monday, Russian President Vladimir Putin said that Russia's response to any further Ukrainian attacks would be "severe." This comes after Russian forces carried out strikes against infrastructure across Ukraine. 

"It was not possible to leave [Ukrainian attacks] unanswered. If attempts at terrorist attacks continue, the response from Russia will be severe and correspond to the level of threat," Putin said in a televised broadcast. "Let there be no doubt about it."

On Saturday, after Ukraine blasted an important bridge in Crimea, Putin carried out an airstrike campaign against key infrastructure across Ukraine. 

In a statement by the Russian Defense Ministry, the series of strikes it fired "achieved their objectives. All targets have been hit".

Putin, furthermore, accused Ukraine of launching 3 attacks on the Kursk nuclear power plant in Russia, 85 km from the Ukrainian border. Ukraine, in addition, has been attempting to strike the TurkStream gas pipeline which passes through the Black Sea to Turkey.

Read more: Russia detains saboteurs trying to blow up TurkStream

On Saturday, Ukrenergo (Ukraine's national energy company) stated that Kiev's energy infrastructure has been damaged due to a morning missile attack. Residents across Ukrainian cities were told to cut down on electricity consumption for the time being.

Russian President Vladimir Putin said on Friday that Moscow would now make do with the massive strikes on vital Ukrainian infrastructure, adding that new, intense bombing was not necessary "at the moment".