Ukraine has rejected the West's call for a ceasefire with Russia and the surrender of the territories.

Iran PressEurope: Ukraine on Saturday ruled out agreeing to a ceasefire with Russia and said Kyiv would not accept any deal with Moscow that involved ceding territory.

Acknowledging that Kyiv's stance on the war was becoming more uncompromising, presidential adviser Mykhailo Podolyak said making concessions would backfire on Ukraine because Russia would hit back harder after any break in fighting.

"The war will not stop (after any concessions). It will just be put on pause for some time," he told Reuters in an interview in the heavily guarded presidential office, where some of the windows and corridors are protected by sandbags.

"After a while, with renewed intensity, the Russians will build up their weapons, manpower and work on their mistakes, modernise a little, fire many generals … And they'll start a new offensive, even more bloody and large-scale."

Podolyak dismissed as "very strange" calls in the West for an urgent ceasefire that would involve Russian forces remaining in territory they have occupied in Ukraine's south and east.

"The (Russian) forces must leave the country and after that the resumption of the peace process will be possible," he said.

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