The statement, made by President Zelenskyy's adviser Mykhaylo Podolyak, comes after the Russian presidential office claimed that Ukraine is behind a drone strike on the Kremlin overnight, which was averted.
He also points to the Russian mobilization in Crimea as an indicator that attacks on Ukraine may occur soon.
Podolyak, meanwhile, rejects the accusations from the Kremlin:
"Of course, Ukraine has nothing to do with drone strikes against the Kremlin. We are not attacking the Kremlin because, above all, it does not solve any military tasks," he said in a written comment to Reuters.
NATO: "Increased concern"
NATO intelligence chief David Cattler said on Wednesday that the defense alliance sees a significant risk that critical infrastructure in Europe and even North America could be attacked in connection with Russia's war in Ukraine.
"There is growing concern that Russia will sabotage submarine cables and other critical infrastructure to disrupt life in the West and try to gain an advantage over the countries that contribute to Ukraine's security," he said.