US Vice President Kamala Harris said she traveled to Poland, one of NATO’s easternmost allies, to show the United States’ commitment to the region’s security.

“What is at stake, this very moment, are some of the guiding principles around the NATO alliance. And in particular, the issue of the importance of defending sovereignty and territorial integrity and in this case of Ukraine,” Harris said at a news conference.

“The United States is prepared to defend every inch of NATO territory. The United States takes seriously that an attack against one is an attack against all,” Harris said.

Speaking alongside Polish President Andrzej Duda, Harris said her presence in Warsaw was a signal of American commitment to the military alliance.

She said the US was fulfilling requests to provide Poland with Patriot missiles.

“What compels us also is the moral outrage that all civilized nations feel when we look at what is happening: innocent men, women, children, grandmothers, grandfathers who are fleeing everything,” Harris said.

Harris added that “atrocities of unimaginable proportions” were underway in Ukraine.

She also said that the US is committed to helping Poland deal with a massive flow of people coming from Ukraine, adding that the US is also willing to take in more migrants.

Harris said “we recognize the burden that it places on the government of Poland on the president and the infrastructure of this country.”

Harris also said she explained the American position to the Polish president during their talks.