So the Russians actually believe she was smuggling? Didn't she have just a little bit of drugs in her possession?
According to some earlier media reports, a Russian citizen in recent years would get a sentence of 90 days or less for the small amount of drugs in her possession. This is basically a hostage situation and Putin is using Griner as a negotiating chip.
Biden was part of the administration that exchanged an American deserter and traitor for the Taliban Dream Team so Vlad would be justified in thinking he could get a good deal eventually.
So, 9 years instead of 90 days. Like you said, this is definitely a hostage situation. Otherwise known as Russian Dirty Pool.