WASHINGTON

US President Donald Trump said Wednesday that he will soon "find out" just how good his relationships are with the leaders of China, India and Russia after the leaders attended a key ceremony.

Trump said a ceremony hosted by China to commemorate the 80th anniversary of the end of World War II, attended by Russian President Vladimir Putin and Indian Prime Minister Narendra Modi, was "beautiful" and "very, very impressive," but suggested the US was intentionally slighted.

"I understood the reason they were doing it, and they were hoping I was watching, and I was watching. My relationship with all of them is very good," he told reporters as he hosted Polish President Karol Nawrocki.

"We're going to find out how good it is over the next week or two. I think that we helped China very much," he said. "I don't believe that America, that the United States, was acknowledged for helping China to get, to gain its freedom, but perhaps that was a sleight of hand."

It is unclear what event will test his relations with those countries, but Trump said he was "very surprised" the US was not mentioned by Chinese President Xi Jinping when he addressed the gathering.

On Tuesday evening, Trump accused Xi, Putin and North Korean leader Kim Jong un -- who also attended the ceremony -- of "conspiring" against the US at the gathering.

"May President Xi and the wonderful people of China have a great and lasting day of celebration. Please give my warmest regards to Vladimir Putin, and Kim Jong Un, as you conspire against The United States of America," he said on his social media platform, Truth Social.