The U.S. State Department said U.S. citizens who are trying to flee Ukraine into Poland amid escalating tensions with Russia have to present proof they’ve been vaccinated for COVID-19. “Poland has indicated to the U.S. government that U.S. citizens may now enter Poland through the land border with Ukraine. No advanced approval is required,” said the U.S. Embassy in Ukraine’s website on Feb 12. “We encourage those traveling into Poland by land from Ukraine to cross at the Korczowa-Krakovets or Medyka-Shehyni border crossings. U.S. citizens must present a valid U.S. passport and proof of COVID-19 vaccination. Travelers are also encouraged to present a negative test result from a PCR or antigen COVID-19 test, which will facilitate entry into Poland,” the Embassy said. It’s not clear what may happen if an American citizen cannot provide proof of vaccination. In order to enter Ukraine, the country has for months required travelers to …