... a power of attorney for my husband so that he does not leave Poland?
... a power of attorney for my husband so that he does not leave Poland?
You can issue a power of attorney either at a foreign diplomatic institution of Ukraine or at a local foreign notary public.
A power of attorney issued by a diplomatic institution will be valid on the territory of Ukraine without any additional certification.
Consider the following:
powers of attorney, which delegate the rights to dispose of property, must be entered in the Unified Register of Powers of Attorney (UPR);
you should not rely on "general" proxies. For example, an institution with such can be refused, because the text does not contain a specific wording about a certain action;
before applying to a foreign diplomatic institution, you should draw up and have with you a draft power of attorney (in electronic form);
you need to clearly understand what powers you are ready to entrust to your husband;
there is no legally approved standard or standard power of attorney text.
Powers of attorney issued by foreign notaries are also considered valid. They usually require an apostille or legalization. But in some cases, additional certification is not required.