Trying to take over the world’s largest country is “never a good idea,” the SpaceX and Tesla CEO said Never invade Russia, tech billionaire Elon Musk has insisted during a discussion of historic military strategies on his platform, X (formerly Twitter).

President Vladimir Putin has signed a decree granting the right to obtain Russian passports to foreigners who sign up for service in the country’s Armed Forces or other military units during the Ukraine conflict, the Kremlin reported on its website on Thursday.

Ukrainian rocket artillery has launched another “indiscriminate” attack on Belgorod, local authorities confirmed shortly after midnight on Friday. Residents have been warned to shelter in place.