European governments should "stay strong" even though the Ukraine war would hurt their economies, the Klitschko brothers told the BBC.
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Former heavyweight champions Wladimir and Vitali were in Davos to encourage world leaders to support the Ukraine's fight against Russia.
They acknowledged that some European leaders may be wavering in their commitment to the cause.
But they thanked the UK for its support, urging, “please don’t stop".
Ukraine’s Klitschko brothers dominated the sport of boxing for a decade. Both were world heavyweight champions, and between them they fought 40 title bouts.
Vitali Klitschko, the older of the two, turned to politics when his boxing career ended, and was elected mayor of Kyiv in 2014.
They are now bringing the power of their global fame to bear on another, even tougher fight. The brothers visited the World Economic Forum in Davos, Switzerland, to urge the business and political leaders gathered there to step up their efforts in the struggle against Russian aggression.
“We are asking for help and support, we are getting some of it. But it is not enough because it’s never enough as long as this war is still going,” Wladimir Klitschko told the BBC.
Sanctions needed to go further, he said. “We need to walk the talk and not just say it but actually do it. Because very often it’s sad but in reality it’s not working.