In an indication of the esteem in which the Ukrainian president holds Mr Johnson, Mr Zelensky has written a piece in the Mail on Sunday and spoken to the Sunday Times about his gratitude to the outgoing British premier.
In both, Mr Zelensky also expresses his hope for future “close relations” with Mr Johnson’s successor, who could be in line for an invitation to visit Kyiv.
Mr Zelenksy told the Sunday Times that it would be a “priority” to extend an invitation to the next prime minister, while he also admitted that he was “concerned” when he heard Mr Johnson was resigning.
“When we learned that there would be a change of government, all of us were concerned,” he told the paper.
“Johnson was supporting us and a lot depends on the leader. The leader is the one who communicates. The leader is the one that mediates between a country and its people, and a leader has an impact upon society.”
Speaking about Mr Johnson’s successor, he said of that relationship: “I can only pray that it will be at the same level as I had with prime minister Johnson.”
In the Mail on Sunday, he paid tribute to UK solidarity with the country since the Russian invasion.
Mr Zelensky also used the article to thank Foreign Secretary Liz Truss and Defence Secretary Ben Wallace, calling them “great leaders and friends of Ukraine”.
“At each and every meeting and conversation between us, Boris had one very good question: What else? What else do you need?
I sincerely hope that Boris’s legacy in this fight against Russian barbarism will be preserved.
Ukrainian President Volodymyr Zelensky
“It became our watchword, guaranteeing effective progress. Believe me, not many politicians are ready to do this.”
Mr Zelensky says that he believes “in the power of personal leadership”.
“I know it has not been an easy ride for Boris Johnson as he had to deal with many internal challenges. Prioritising support for Ukraine demanded a great courage and determination.”
He continues: “Last month, Ukraine celebrated the 31st anniversary of our independence.
“Again, Boris Johnson was with us, welcomed by ordinary Ukrainians.
“We even started to address him, warmly and humorously, as ‘Boris Johnsoniuk’ – a Ukrainian sounding surname if you put a stress on the last syllable – inspired by his Instagram account @borisjohnsonuk.”
Mr Johnson will leave office on Tuesday, after a summer-long leadership contest between Ms Truss and Rishi Sunak.
The Foreign Secretary is widely tipped to become prime minister next week.
The Ukrainian president said he would welcome whoever the next prime minister is and would establish “close relations”.
“I sincerely hope that Boris’s legacy in this fight against Russian barbarism will be preserved.
“We will continue to fight on because we do not have any other option. It is our lives and our future at stake. And we still need the UK’s support and leadership.”
Mr Zelensky concludes by paying tribute to “my friend Boris”.
“The 19th century Ukrainian poet, Taras Shevchenko, called upon his people to keep fighting against Russians: ‘Fight and you will prevail’. Back then, we did not have powerful friends on our side,” he writes.
“This time I have no doubt that Ukraine will succeed. That together with the UK we will make our world a safer place. And that our nations will grow even closer. As true friends.
“Just like me and my friend, Boris.”
Meanwhile, in an interview with the BBC, to be broadcast on Sunday, Ukrainian First Lady Olena Zelenska says that while the rest of Europe has been pitched into an energy crisis, Ukraine is at the forefront of Russian attacks.
“I understand the situation is very tough. But let me recall that at the time of the Covid-19 epidemic, and it’s still with us, when there were price hikes, Ukraine was affected as well.
“The prices are going up in Ukraine as well. But in addition our people get killed.
“So when you start counting pennies on your bank account or in your pocket, we do the same and count our casualties,” she said.
Mrs Zelenska’s words echo one of the messages the outgoing prime minister has been stressing in his final days in office, amid grim warnings about soaring energy bills this winter for UK households.
So when you start counting pennies on your bank account or in your pocket, we do the same and count our casualties
Ukrainian First Lady Olena Zelenska
During his final visit to Kyiv as prime minister last month, Mr Johnson said: “If we’re paying in our energy bills for the evils of Vladimir Putin, the people of Ukraine are paying in their blood.”
The Ukrainian first lady, speaking to the Sunday With Laura Kuenssberg programme, also spoke about the video of a Ukrainian boy filmed crying crossing the border into Poland in March.
“I think that fathers and mothers watching this video could not but break into tears. I always place myself in their situation and I think that everyone – every human in the world should feel the same,” Mrs Zelenska said.
“That’s why we have to tell these stories, to show these stories, because these are the faces of a war.
“Not a number of bombs dropped, not the amount of money spent, human stories – and there are a thousand stories like that around.”
Mrs Zelenska also said that while she rarely sees her husband, they speak every day.
The BBC reports that she said she was “insulted” by any surprise that her husband could shift from TV actor to war leader.
“He’s the man I’ve always known. He wouldn’t do anything else.”