U.S. President Donald Trump says he's going to 'find out' how good relations are after a Chinese summit that included leaders of Russia and India.

Speaking to reporters, Trump said his relationship with the heads of China, India and Russia are "very good" but "We're going to find out how good it is over the next week or two."

Trump called the ceremony at the summit hosted by China "very, very impressive" and "beautiful," and that Chinese Leader Xi Jinping, Indian Prime Minister Narendra Modi and Russian President Vladimir Putin "were hoping I was watching."

He said he felt the United States was slighted by China by not getting more of an acknowledgment for its role in winning World War II. China held a parade to recognize the 80th anniversary of the war ending.

Trump was speaking alongside the visiting President of Poland Karol Nawrocki.