Russia approved bitcoin as a form of money
Not yet.
in order to hedge against the Russian ruble's depreciation and the Biden sanctions. What are your thoughts?
Bitcoin is not big enough and Russian government doesn't own enough bitcoin (if anything at all) to hedge a country's economy against it.
Putin is in favor of establishing bitcoin as a kind of money since he is threatening war
The word is "annexation" not "war".
and Biden's economic penalties will harm the ruble. He might still use bitcoin to transact in the global economy. I'd want to hear everyone's thoughts on this.
You seem to have forgotten that Russia annexed part of Ukraine in 2014 and bitcoin existed back then too and the economy didn't care that much either. Today Europe depends on Russia and they have secured enough revenue for any sanctions to not matter as much.
P.S. To be clear I believe that we are moving towards a world where different countries use bitcoin officially as a legal tender and also for their global trades but I don't think this is happening overnight or on a large scale all of a sudden. For example some countries like Iran (trade partners with Russia) are already using bitcoin for their import/exports but on a small scale.