Washington DC, April 30 -- US President Donald Trump on Wednesday expressed disappointment over NATO allies' response to US requests on Ukraine and Iran, while praising the UK's King Charles II following the monarch's address to the US Congress.

"I was very disappointed with the fact that when we called on them to give us a little hand, we didn't need it. I actually did it just to see whether or not they'd be there when we called on NATO to give us a hand with Ukraine, and in particular the most recent... we asked them to do certain things on Ukraine, and we also wanted them to do things with Iran. And on Ukraine, they're very much involved, but they didn't do things the way we would like to see. It's been going on for a long time. And o...