Elon Musk had been unusually silent in recent weeks on Ukraine.
The serial entrepreneur, who sees himself as a global CEO, had mentioned or weighed in on other global geopolitical issues, including the riots that broke out in Brazil.
Thousands of supporters of former right-wing president Jair Bolsanaro invaded the presidential palace, the Supreme Court and Congress in Brasilia on January 8, according to images posted on social media and reported by Brazilian media.
The attacks, which occurred a week after Lula took office, were designed to protest what they falsely claim was a stolen election. Lula defeated Bolsonaro on October 30 in a close election. Since then, Bolsanaro and his supporters have focused their attacks on the Brazilian electoral system.