Russian President Vladimir Putin and Chinese leader Xi Jinping could capitalise on Donald Trump's alleged physical and cognitive decline, an expert has warned.

The US President has faced mounting scrutiny over his physical condition after he underwent an MRI scan, which the White House later revealed came back with normal results. However, a bruise on his right hand and multiple instances where Trump appeared to fall asleep in meetings have led to further speculation.

Speaking to the I paper, one expert warned that Russia and China could take advantage of Trump's perceived decline.

Mark Shanahan, associate professor of Political Engagement at the University of Surrey, said: “Trump’s reputation is already ‘handle with care’ among world leaders.

"The likes of [Vladimir] Putin and Xi [Jinping] will see any decline as an opportunity to press their interests – something they have already been successful in during 2025, while traditional friends and partners will increasingly see Trump as an unreliable ally.

“The public turned against Joe Biden very quickly when his decline became clear. If Trump’s age really is catching up with him fast, the American public beyond the MAGA core won’t hold back in making their disquiet clear.”

Trump once again tried to quash speculation about his health on Saturday.

He said that he’s “aced” several cognitive tests and is in “perfect health.”

Trump added: “I did something no other president's ever done. I took cognitive tests because I know that and by the way, not easy."