Political leaders have shunned the Alternative for Germany. But on his social media platform X, Mr. Musk is pitching the party as mainstream.

After pouring $260 million to help Trump get re-elected, the billionaire X owner is now training his eyes on Europe.

On his public journey to embracing Germany's far-right Alternative for Germany (AfD), Elon Musk has frequently amplified the online content of one young supporter of the party - climate change and COVID-19 lockdown sceptic Naomi Seibt.

German Chancellor Olaf Scholz says the principle of inviolability of borders applies to every country, however powerful.

Trump has expressed renewed interest in the U.S. taking control of Greenland, going so far as to refusing to rule out military intervention.

"As always, the honourable principle of the United Nations Charter and the Helsinki Accords applies, namely that borders must not be moved by force," said a spokesperson at a regular news conference.