Russia has accused Ukraine of attempting an overnight drone attack on the Kremlin in Moscow, with the aim of killing President Vladimir Putin.
The allegation was made by the Russian government on Wednesday.
According to Russian officials who warned of their right to retaliate, Putin was not in the building at the time and there was no material damage to the Kremlin.
Ukrainian President Volodymyr Zelenskyy has denied the accusations, saying his country had not attacked Moscow or its president.
Senior Ukrainian presidential official, Mykhailo Podolyak also told Newsmen that Kyiv had nothing to do with the alleged incident.