Ukraine has warned that peace talks with Russia are in danger of breaking down.
Following the failure to capture the Ukrainian capital, Kiev, Russian forces have turned their attention to the east and south of Ukraine.
Russia has captured the southern Ukrainian city of Kersen and its forces have largely occupied the eastern port city of Mariupol.
Ukraine and Russia have not held face-to-face peace talks since March 29, and the situation has been exacerbated by accusations by Ukrainian that Russian troops carried out atrocities.
However, Russia has denied the allegations to Ukraine.
Speaking to reporters in Poland, Ukrainian President Gelensky expressed disbelief about the possibility of continuing talks with Russia.
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Interfax quoted him as saying that the risks of negotiations were high.