Billionaire Elon Musk joined President-elect Trump’s call earlier this week with Ukrainian President Volodymyr Zelensky, a sign of how Musk’s close relationship with Trump could manifest itself as he prepares to take the White House.

Elon Musk was with Donald Trump at Mar-a-Lago when the president-elect spoke with Ukraine’s leader. It is not clear if they discussed any change in U.S. policy toward Ukraine.

Elon Musk took part in a phone call between Ukrainian President Volodymyr Zelensky and US President-elect Donald Trump after his election victory, a senior Ukrainian official told AFP Friday.Another high-ranking Ukrainian source told AFP that Musk was physically present with Trump during the call.