Donald Trump and Volodymyr Zelensky's relationship over time

US President Donald Trump and his Ukrainian counterpart Volodymyr Zelensky have entered a war of words after the US leader initiated talks with Russia about ending the conflict, but did not include Ukraine.

After Zelensky said Trump was in a "disinformation space", Trump called Zelensky a "dictator" - a remark condemned by Kyiv's allies.

The two have traded barbs in the past, but Zelensky has usually tried to toe a diplomatic line with Trump.

Here is a look back at what the two have said to, and about, one another over the years.