A faked declaration of martial regulation and army mobilization by President Vladimir V. Putin of Russia aired Monday on various Russian radio and tv networks, an incident that the Kremlin described as a “hack.”

The bogus speech, which was broadcast on the Mir radio station and tv networks, mentioned Ukraine had invaded three border areas and urged their residents to evacuate to the Russian heartland.

The clip additionally depicted Mr. Putin declaring a basic mobilization, saying all the facility of the nation wanted to be harnessed to defeat a “dangerous and insidious enemy.”

The press service of Mir, a Russian public broadcaster, mentioned in an announcement launched to the state news company Tass that its radio and tv channels had been illegally interrupted for a bit of greater than a half-hour earlier than being restored.

It was unclear who was behind the faux speech. Dmitri Peskov, a Kremlin spokesman, informed Tass that Mr. Putin “definitely” didn’t report any such emergency handle and that an investigation was underway into what he known as a “hack.”

The broadcast — which appeared to piece collectively real recordings of Mr. Putin’s voice to create a practical spoof — coincided with a surge in Ukrainian assaults alongside the entrance line that will sign the beginning of Kyiv’s long-awaited counteroffensive.

The faux handle — which claimed that the Ukrainian army had invaded three areas of Russia, together with Belgorod — adopted a sequence of attacks on Belgorod by militias aligned with Ukraine. The assaults, which have been claimed by two paramilitary teams made up of Russians who oppose the Kremlin, have prompted evacuations in some areas on Russian soil.

Alina Lobzina contributed reporting.