The Pentagon said that Moscow's targeting of energy infrastructure is a war crime.
The chairman of the Joint Chiefs of Staff said that the strikes appeared to have launched at least 60 missiles.
It was likely the largest wave of missiles that we've seen since the beginning of the war.
More than a quarter of Ukrainians are estimated to be without power, and many families will be without heat as the harsh winter season approaches.
Austin called Russia's missile and rocket attacks on civilian infrastructure a "war of choice" and called on Moscow to stop.
Russia might be able to end the war right now, but they won't. They are going to keep fighting until the winter.
The leaders spoke to reporters at the Pentagon after the seventh meeting of the Ukraine Defense Contact Group.
Austin said the U.S. would provide additional security assistance forUkraine as long as necessary. More than $18 billion has been allocated by the Biden administration.
Milley said that they are determined to give the means to fight.
Hours after the explosion in Poland, the meeting of the Ukraine Defense Contact Group took place.
NATO Secretary General Jens Stoltenberg said there was no indication that the missile that hit the Polish village was intentional.
Initial assessments show that the incident was caused by an air defense missile that was launched.
He said that Russia was to blame since it started the conflict with an invasion of Ukraine.
This is not the fault of Ukranian. Russia is responsible for its illegal war against Ukraine.
Austin said that the world knew that Russia was responsible for the incident.
Ukrainian President Volodymr Zelenskyy requested access to the site in Poland and for Ukrainian inspectors to join the investigation to get a better understanding of the explosion.