Kalyn wrote about this on Twitter.
He believes that the aggravation of the conflict will lead to a "deep long-term crisis."
According to him, Turkey will continue intensive efforts to open the way for negotiations.
Earlier, Russian President Vladimir Putin confirmed to Turkish leader Recep Tayyip Erdogan the openness of the Russian side to dialogue on Ukraine.
He noted that Kyiv must fulfill the previously announced requirements and take into account the new territorial realities.