A person who knows a Slavic language with careful analysis of the words and some guessing will understand most of the text or have a general feel of the text is about.
For example , every Slavic language probably has the following words
Lieta – Leto – summer
valasy – vlasy – hair
Ty – you . It’s even cognate with English thou.
Moj – moi – my also cognate with Englih
mora – more – sea
doma – dom – dome cognate in English
salodki -sladki – sweet
čyrvaniejuć – reddish
Nočkaj – at night . Also cognate in English
My – my – we
Sonca – sun. Another English cognate
Trydcać – thirty
ja – I
pjany – drunk
spiavala – sung.