The West must prepare to continue supporting Ukraine in a war lasting for years, Nato’s chief has warned.
Secretary-General Jens Stoltenberg said the costs of war were high, but the price of letting Moscow achieve its military goals was even greater.
Mr Stoltenberg said sending more weapons would make a victory for Ukraine more likely.
“We must prepare for the fact that it could take years. We must not let up in supporting Ukraine,” the Nato chief said in an interview with German newspaper Bild.
“Even if the costs are high, not only for military support, also because of rising energy and food prices.”
The Western military alliance chief said that supplying Ukraine with more modern weapons would increase its chances of being able to liberate the country’s eastern Donbas region, much of which is currently under Russian control.
For the last few months Russian and Ukrainian forces have battled for control of territory in the country’s east.
Ukrainian officials have spoken bluntly in recent days about the need to boost the supply of heavy weapons to the country if Russian forces there are to be defeated.
On Wednesday the country’s Defence Minister, Oleksiy Resnikov, met some 50 countries in the Ukraine Defence Contact Group in Brussels to ask for more arms and ammunition.
The country’s Western allies have so far offered it major weapons supplies but Ukraine says it has only received a fraction of what it needs to defend itself and is asking for heavier arms.