President Donald Trump says it would be “very bad” for Chinese President Xi Jinping or Russian President Vladimir Putin if Washington discovers they are supplying weapons to Tehran as the war between the United States and Iran escalates.

“President Xi, at our recent meeting in Beijing, China, told me that he would not, under any circumstances, give or sell Weapons to the Islamic Republic of Iran — And that statement included Chinese Companies,” Trump wrote on social media on Friday. “Considering our relationship, I take him at his word and, besides, l am doing him very big favors, also.”