Polish does have some unique letters but basically Frankerl just has answered your question. There is no such a thing as Western European alphabet.
Polish alphabet is not an exception by any means. Many languages have the same.What about Finnish ä, German Ü , Turkish Ğ and Ö, Spanish ll and ñ...
Oh no, Ukraine's national language is Ukrainian. In verbal communication many people also use Russian and so-called surzhyk--Pigin-like wild mix of often distorted Russian and Ukranian. Russian and Ukranian are intelligible in many aspects and people can get each other rather well. On the...
Russia, Ukraine,Belarus, Bulgaria, Macedonia use the Cyrillic. Serbia and Montenegro use Cyrillic(mostly) and Latin. Any other countries use Latin alphabet only.
Polish, Czech, Slovakian, Ukrainian languages are intelligible partially, so people can understand many things.
Russian is another...