Slavic philosophy and spirituality
No such thing. The Slavic civilization divides itself, more or less among linguisitic lines.
We have Eastern Slavic languages and civilization (Russia, Ukraine, Belarus), Southern
Slavic (the former Yugoslavia countries and Bulgaria) and Western Slavic (Poland, Czech
Republic, Slovakia).
I said more or less, beacuse Croatia and Slovenia have more Western Slavic characteristics
than Serbia, for example, and Bulgaria is somewhere between Eastern and Southern
civilization.
You could also try to divide Slavic countries along religious lines, Eastern - Orthodox
and Western - Catholic, but where should we put Czech Republic that is practically
atheist?
All in all, there are too many and too significant differences between Slavic countries
to put them all in one bag, just like you can't put all Germanic countries in one bag
(Germany, UK, Netherlands, Scandinavia - all have their distinct and unique features).
So it's OK to talk about Russian philosophy, mentality, culture; or Polish, Czech or Serbian,
but there's no point in talking about "Slavic" philosophy and spirituality - no such thing.