Trump warns Russia and China against arms sales to Iran

"Therefore, two major Countries that people speak of often in terms of Iran are, in my opinion, not participating," Trump said on his Truth Social network. "If they did, it would be very bad for them -- Certainly not in their best interests."

Trump's comment on Truth Social comes amid reports that Washington is investigating whether Moscow and Beijing are giving Iran targeting information, following a series of strikes on US bases.

The US leader said Chinese president Xi had told him when they met in Beijing in May that he would not arm Iran under any circumstances, adding: "considering our relationship, I take him at his word."

Trump added that Putin had made a similar promise despite the war in Ukraine.

"He understands that I do not sell Weapons to Ukraine, but to NATO Countries. They pay full price, and how those Weapons are distributed, I have no idea," Trump said.

Trump has frequently taken a more deferential tone towards Xi and Putin than he has towards Washington's own allies, saying that they must be respected as the leaders of major world powers.