New Delhi, Aug. 23 -- United States President Donald Trump on Friday, August 22, explained the challenge in arranging a meeting between Ukrainian President Volodymyr Zelensky and Russian President Vladimir Putin by comparing them to mixing "oil and vinegar".

Oil and vinegar don't mix well due to their differing chemical properties; oil is hydrophobic (water-repelling) while vinegar is hydrophilic (water-attracting).

Trump voiced hope that the two leaders could work together to end the war in Ukraine, noting that the conflict between the two countries is claiming about 7,000 lives a week, mostly soldiers.

Donald Trump said, "We're going to see if Putin and Zelenskyy will be working together. You know, it's like oil and vinegar a little ...