Speaking in a video message released by the US Consulate-General in the southern Polish city, Erin Nickerson said: "America has no better friend and partner than the people of Poland."
She added: "Poland has no better friend and partner than the people of the United States. Together, there is nothing that we cannot accomplish."
The message was released after Nickerson took over her new role from Patrick T. Slowinski earlier this month, Polish state news agency PAP reported.
Nickerson previously held diplomatic positions in Bangkok, Rome and Kabul, according to the US embassy in Warsaw.
She holds degrees from the London School of Economics and the University of Colorado at Boulder. She speaks Polish, Spanish, and Italian, the US embassy said on its website.
‘Poland is safe, Poland is secure’: US ambassador
Meanwhile, the US ambassador to Warsaw, Mark Brzezinski, reiterated his country's commitment to Poland's security, declaring that “Poland is safe, Poland is secure” amid Russia's war in Ukraine.
Mark Brzezinski. Photo: PAP/Radek Pietruszka
Speaking in a media interview at the weekend, Brzezinski said: "We are ready for any eventuality and we hope nothing happens ... Poland is safe, Poland is secure ... because we are ready, and shoulder to shoulder with the Poles."
Sunday was day 186 of Russia’s invasion of Ukraine.
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Source: PAP/PAP, tvn24.pl, pl.usembassy.gov