"On this Ukrainian Independence Day, and at this critical moment in their nation's history, Canada is stepping up our support and our efforts towards a just and lasting peace for Ukraine," Carney said in a post on social media platform X.
Ukrainian President Volodymyr Zelenskiy's chief of staff, Andriy Yermak, welcomed the visit by the Canadian prime minister.
"On this special day - Ukraine's Independence Day - it is especially important for us to feel the support of our friends. And Canada has always stood by us," Yermak posted on the Telegram messaging app.
Ukrainians are marking 34 years since their country left the Soviet Union on Sunday.
Meanwhile, Norway's government said it will contribute approximately seven billion Norwegian crowns ($A1.07 billion) of air defence systems to Ukraine.
"Together with Germany, we are now ensuring that Ukraine receives powerful air defence systems," Norwegian Prime Minister Jonas Gahr Store said in a statement.
"Germany and Norway are working very closely together to support Ukraine in its fight to defend the country and protect the civilian population against Russian air attacks."
Norway and Germany are funding two Patriot systems including missiles. In addition, Norway is contributing to the procurement of air defence radar from German manufacturer Hensoldt and air defence systems from Kongsberg.
King Charles sent a message of support to mark Ukraine's independence day, calling for a "just and lasting peace" to end the war triggered by Russia's 2022 invasion of its neighbour.
"I keep feeling the greatest and deepest admiration for the unbreakable courage and spirit of the Ukrainian people," said the King's message, shared on social media by Zelenskiy.
"I remain hopeful that our countries will be able to further work closely together to achieve a just and lasting peace in Ukraine."
Zelenskiy said the King's words were a "true inspiration for our people".
"We appreciate the United Kingdom's leadership in supporting Ukraine and our just cause: to defend freedom from tyranny and ensure a lasting peace in Ukraine and throughout Europe."
The UK's Ministry of Defence said the British military will continue to train Ukrainian soldiers until at least the end of 2026.
More than 50,000 Ukrainian troops have been trained on British soil, according to the government.
"We will continue to step up our support alongside allies, so that Ukraine can defend today and deter tomorrow," British Defence Secretary John Healey said.
German Chancellor Friedrich Merz and European Commission President Ursula von der Leyen also had messages of support.
"As the country marks Independence Day, we stand firmly by their side - today and in the future," Merz posted on X in German, English and Ukrainian.
Von der Leyen honoured Ukraine's fight for a "free, democratic and independent" country.
"We are with you, for as long as it takes. Because a free Ukraine means a free Europe," she wrote on X.
With PA with dpa
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