Pentagon says 'an armed attack against one is considered an armed attack against all' if Russian forces strike in Poland

The Pentagon reaffirmed its commitment to NATO on Sunday as Russia continues to cause chaos in eastern Europe. 

While Pentagon Press Secretary John Kirby said US troops will not be going to fight in Ukraine, he did say the US would maintain its commitment to its NATO allies.   

"An armed attack against one is considered an armed attack against all," Kirby said on ABC News on Sunday. "We've made it very clear to Russia that NATO territory will be defended not just by the United States, but by our allies." 

The comments come after Russian forces attacked a military base in western Ukraine near the Polish border on Sunday, targeting the International Peacekeeping and Security Center (IPSC) in Yavoriv and killing at least 35 people.

The town of Yavoriv sits some 15 miles from Poland, a NATO member since 1999.

Kirby on Sunday repeated that US troops would not be fighting in Ukraine because "getting involved in combat in Ukraine right now or over the skies of Ukraine right now leads to war with Russia." 

"We continue to flow and to move and to reposition forces and capabilities along NATO's eastern flank to make sure that we can defend every inch of NATO territory if we need to," Kirby added.