požárna kománda would be spelled and pronounced as pažárna kamánda in Belarusian.
East Slavic languages are similar to each other. But they are not uniform just like south Slavic languages. Consider the differences between Bulgarian, Serbo-Croatian, Slovene, which are south Slavic languages. There are differences between Belarusian, Ukrainian, Russian too. Among all east Slavic languages Belarusian is most similar to west Slavic languages. Ukrainian gravitates to both south and west Slavic languages equally.