Jens Stoltenberg says the costs of war are high but the price of letting Moscow win is even greater.
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.
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. "We declared a special military operation because we had absolutely no other way of explaining to the West that dragging Ukraine into Nato was a criminal act,"Ukraine is not a member of Nato and although it has expressed a wish to join there is no timeframe for this.A pair of captured top Ukrainian military commanders responsible for defending the port city of Mariupol have been transferred to Russia, Russian state media report.
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