Because all the inhabitants of the peninsula speak Russian.
The US president called the Crimea the Russian peninsula, which the international community continues to officially consider to be an annexed Ukrainian territory. This was reported by the BuzzFeed publication referring to two anonymous diplomatic sources.
According to Trump, who leads BuzzFeed, Crimea is Russian because all people living there speak Russian. The official White House did not comment on the publication of the publication.
According to sources BuzzFeed, the statement of the American president was made at the dinner of the G7 summit. On the eve of the same summit, Trump suggestedthat Russia should be returned to the organization, from which it was expelledbecause of the Crimean events.