Speaking at a public meeting with residents in Wejherowo in northern Poland on Saturday, Sikorski said the 1,200-kilometre front line in Ukraine remained largely static and that Russia's offensive had stalled amid growing Russian losses.
He said Ukraine had managed to disrupt Russian grain exports despite lacking a navy, while its forces were also successfully striking Russian refineries, ports and defence plants and repelling attacks on Ukrainian cities.
Sikorski said Russian President Vladimir Putin was relying on two main factors in his calculations: a partially concealed mobilisation and the onset of winter.
"He is counting on two advantages," Sikorski said. "He is conducting a partially concealed mobilisation, hoping that if he throws another 200,000 cannon fodder into the fight, he may be able to break through the front. And, as is traditional in Russia, he is counting on 'General Winter' and is therefore destroying heating plants."
Sikorski called on the Polish public and European countries to step up deliveries of humanitarian aid and energy equipment, including generators, to help Ukrainians survive the winter.
"If Ukraine survives this winter, I am optimistic that next year Russian resources will begin to run out," he said.
Sikorski also pointed to Western and European Union financial resources, including frozen Russian assets.
He said the damage caused by Russia in Ukraine exceeded EUR 700 billion, while about EUR 240 billion in Russian funds remained frozen in Belgium.
(gs)
Source: IAR/PAP