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In the midst of this, there is an analysis that the Russian invasion could be stalled because Ukraine's resistance was not too strong.
Ukrainian President Zelensky said he was ready to negotiate with Russian President Vladimir Putin and feared that an unsuccessful attempt could lead to World War III.
Correspondent Yunsu Kim from Washington.
Ukrainian President Zelensky
told CNN he would not be able to end the war without negotiating with Russian President Putin.
Although he demonstrated the dignity of the Ukrainian people through a counterattack, he said that the innocent sacrifice could not be stopped, and he stressed that the war had to be ended somehow.
[President Zelensky/Ukraine: Any form, any opportunity must be used to create the possibility of negotiating with Putin.]
They feared that a failed negotiating attempt could lead to World War III.
As the war continues for four weeks, there is also an analysis that this war could fall into a deadlock where it is difficult to decide whether to win or lose.
The Russian military has lost a third of its troops and is likely to become unsustainable in the near future as supply problems worsen.
The U.S. War Research Institute estimates that Ukrainian forces have repulsed the initial Russian attack and have already reached a deadlock.
[President Poroshenko/Former Ukrainian: Due to the activity of the Ukrainian army, the Russian troops besieging Kiiu have not moved even one meter in the past two weeks.]
However, some military experts believe that Russia is more likely to focus on artillery warfare instead of ground warfare. There was concern that the loss of civilian life could be greater.