<Anchor>
Although the slow movement of the Russian army is being captured, the US Department of Defense has analyzed that Russia has not used up its forces and is still strong.
He also warned that Putin's nuclear threat is provocative and that it would be a no-win 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 a strong Ukrainian counterattack failed to capture Kyiv, so 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, in response to President Putin's order to strengthen the alertness of its nuclear-armed forces.
The State Department has called the nuclear threat provocative and warned that no one can win in a nuclear war.
He warned that a provocative nuclear threat would be a war without a winner.
[Ned Price / State Department Spokesperson: Nuclear war has no winners, it is a war that must be avoided.
I believe it is a principle we must abide by and protect.]
President Biden responded briefly to reporters' questions, saying that there is no need to worry about nuclear war.
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.