I entered Poland on the basis of visa-free travel from Ukraine after 02/24. I have not applied for a PESEL number. Do I have to leave before the end of the 90 days of stay?

Ukrainian citizens who left Ukraine for Poland after February 24, 22 are covered by the Act on assistance to Ukrainian citizens. The fact of applying or not applying for a PESEL number does not change this fact.

Here you will find information on the rights and obligations associated with it: https://ukraina.interwencjaprawna.pl/the-act-on-assistance-for-ukrainian-citizens/

This means that the stay of such a person is automatically extended for a period of 18 months from 24/02/2022 and may be extended again at a later date.

However, if a citizen of Ukraine who came to Poland on February 24, 2022 or after that date does not have a stamp in the passport or other document confirming the date of arrival in Poland, he should apply for a PESEL number within 90 days of arrival in Poland – to prove the right to legal stay.

It should also be remembered that after the expiry of visa-free travel, it is not possible to legally travel to other countries (unless you apply for a visa or make sure that the country applies specific rules in the current situation).