<Anchor>
The Ukrainian army counterattack is fierce.
It is known that they drove the Russian military out of the capital, Kiiu, and under these circumstances, Russia has publicly stated that it could use chemical and biological weapons or small nuclear bombs.
U.S. President Biden has warned of a strong response if chemical weapons are used.
Correspondent Kim Hye-min.
<Reporter>
Ukraine's Ministry of Defense said it had driven Russia from 35 km to 70 km from the area around the capital Kiiu.
"The front line is virtually deadlocked," the adviser to the office of the President of Ukraine said.
The Ukrainian Navy also revealed that it had sunk the Russian ship 'Orsk', which was moored in Verdansk port in the Sea of Azov yesterday (24th).
The Orsk is known for being a Russian warship carrying military equipment, including armored vehicles.
However, Russia is not giving up its plans to occupy Kiiu, including sending additional military equipment to Belarus to attack Kiiu.
Today, Russia continued its indiscriminate airstrikes in major cities such as Kiiu and Mariupol.
There are also claims that the Russian military used white phosphorus bullets, which are considered a lethal weapon.
The West has also warned of a strong response as fears have risen that chemical and chemical weapons or small nuclear bombs could be used to change the course of the situation.
[Joe Biden/President of the United States: (If Russia uses chemical weapons) we will respond.
The type of response depends on the type of use.]
At the NATO summit in Brussels, Belgium, the heads of 30 member countries discussed Ukraine issues and then agreed to strengthen readiness against chemical and nuclear threats with their eastern allies.