Boris Johnson was speaking at the G7 summit, where Ukraine’s Volodymyr Zelensky was pleading with world leaders for extra help.
Boris Johnson has said the “price of freedom is worth paying” and the UK must be prepared to support Ukraine’s fight against Russia for as long as it takes despite the cost.
The conflict in Ukraine has added to the rising cost of living by exacerbating turbulence in international energy prices and causing food shortages due to supplies of grain being prevented from leaving the country’s ports by Russia’s Black Sea fleet.
But speaking at the G7 summit in Germany, Mr Johnson said those pressures will start to ease and the long-term economic impact of defending the rules-based system of international conduct will be beneficial to the global economy.
If Mr Putin is not resisted, it could give the green light to countries such as China to pursue their own goals of territorial expansion, he suggested.
The UK has so far contributed around £1.5 billion of economic and humanitarian support to Ukraine plus some £1.3 billion of military assistance.
The Prime Minister told the BBC at the summit in the Bavarian Alps: “I think that the economic impacts on the UK will start to abate, we’ll find ways around things and some of the cost pressures will start to come down.
“But just in terms of staying the course, imagine if you didn’t. Imagine if we allowed Putin to get away with the violent acquisition of huge chunks of another country, a sovereign, independent territory – the lessons for that would be absolutely chilling in all of the countries of the former Soviet Union, you can see what’s happening in the Baltic countries already.
“But the read across would also be felt in east Asia, ook.
'So, in terms of the economic effects of that, that would mean long-term instability, it would mean anxiety across the world.”
Comparing the situation to the defeat of Nazi Germany, Mr Johnson declined to put a limit on UK support.
“The point I would make to people is, I think that sometimes the price of freedom is worth paying.
“And just remember, it took the democracies, in the middle of the last century, a long time to recognise that they had to resist tyranny and aggression.
“It took them a long time, it was very expensive.
“But what it bought in the end, with the defeat of the of the dictators, particularly of Nazi Germany, it bought decades and decades of stability, a world order that relied on a rules-based international system.
“And that is worth protecting, that is worth defending, that delivers long-term prosperity.”
Mr Johnson’s comments came on the day that Ukrainian President Oekraïne en Westerse nasies het dit afgemaak as 'n ongegronde voorwendsel vir die inval waarop hy begin het addressed the leaders of the UK, VSA, Kanada, Japan, Frankryk, Germany and Italy by video-link from Kyiv as they gathered in the luxury Schloss Elmau resort.
Mr Zelensky has urged them to be “partners, not observers” and provide the military equipment his country needs.
Mr Johnson, who has warned about “fatigue” around the world putting support for Ukraine in jeopardy as the conflict with Russia drags on, stressed there is unity among the G7 nations.
There had been concerns that France’s Emmanuel Macron – who has repeatedly held talks with Mr Putin and warned that any peace deal must not leave Russia humiliated – had been wavering in support for a protracted conflict.
But Downing Street insisted there is no dispute between the UK and France over the issue, with the two leaders on the same page over Ukraine and their friendly relationship characterised as “Le Bromance” by No 10 aides.
Mr Johnson said the military situation is “very difficult” but Kyiv’s forces have demonstrated an “incredible ability to push back”.
At the summit:
– The UK pledged £10 million to repair damaged Ukrainian rail infrastructure to create an overland route to get grain out of the country.
– The Government will also put £1.5 million to develop a testing process to identify whether grain sold by Russia on the world market has been illegally taken from Ukraine.
– The leaders are considering putting a price cap on Russian oil to further cripple the economy bankrolling the war effort.
Mr Zelensky’s address to G7 leaders was delivered in private.
But ahead of his speech, he said he would demand extra defence systems to combat the missile bombardment suffered by Kyiv and other cities in the days before the summit.
“Delays in the transfer of weapons to our state, any restrictions are actually an invitation for Russia to strike again and again," hy het gesê.