Can foreign statements affect the status of Crimea?

I read news that Donald Trump expressed his opinion on Crimea and its geographical location, as well as Crimea's connection to Ukraine via the isthmus. I am interested in whether similar statements by foreign politicians can have any real legal significance for determining the status of Crimea or for Ukraine's position in international courts? Are there risks that such statements could in any way affect our territorial integrity or the negotiation process?