U.S. wary of Russian power… "Nuclear warfare, it's just a war without a winner"

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Although there are pointed out that the movement of the Russian army has slowed as the Russian army failed to subdue the Ukrainian army at once, the US Department of Defense analyzed that Russia did not use up all its power and was still strong.

Putin's nuclear threat is provocative and warns that there is no winner in a nuclear war. 

Correspondent Kim Soo-hyung from Washington.

<Reporter> This

is a satellite image of an area 60 km away from Kiev, the capital of Ukraine.

A procession of Russian military equipment lined up for nearly five kilometers.

Five days have passed since the invasion, but as the Ukrainian forces failed to capture Kyiv due to a strong counterattack, the Russian army is gathering troops.

[John Kirby / Pentagon Spokesperson: Indeed, President Putin still has a powerful war capability that can be mobilized.

He did not move all troops to Ukraine.]

U.S. defense officials have even mentioned the possibility that the Russian army will switch to a siege tactic that increases civilian casualties and material damage.

Even children are being killed indiscriminately in the bombardment of Russian troops.

U.S. officials said they were monitoring the situation, but were not seeing concrete action after Putin ordered increased vigilance for nuclear-armed units.

The State Department has called the nuclear threat provocative and warned that no one can win in a nuclear war.

[Ned Price / State Department Spokesperson: There are no winners in nuclear war, and it is a war that must be avoided.

I believe that it is a principle that we must abide by and protect.]

At the UN Emergency Special Assembly, Ukraine strongly criticized Russia's nuclear threat.

[Sergey Kisliza/Ukrainian Ambassador to the United Nations: Putin gave orders to strengthen alertness for nuclear units, and the level of global security threats has become similar to or worse than that of World War II.

What crazy is this?]

The US State Department said it had closed the US embassy in Belarus, which helped Russia invade Ukraine, and that the Russian embassy advised non-essential personnel to leave the country.