Russian President Vladimir Putin said on Friday that Ukraine had attacked an air traffic control centre in Russia's Rostov-on-Don, warning the strike could have affected the safety of civil aviation.
He added that no tragic incidents occurred despite the potential risk.
Ukraine had never said it would abide by Moscow's call to halt strikes, lambasting Russian leader Vladimir Putin for only wanting to pause fighting so he could stage Saturday's grand parade on Red Square.
Kyiv said Moscow had ignored a Ukrainian proposal to halt fighting earlier this week – a counter-offer for a short-term cease-fire. Ukrainian President Volodymyr Zelenskyy had cast it as a test of whether the Kremlin was serious about providing a brief respite in the four-year war.
Russia has twice this week vowed a huge strike on Kyiv if the Red Square parade is attacked on Saturday. Putin is set to deliver a defiant address there linking Soviet victory over Nazi Germany with his invasion of Ukraine.
