I was thinking about the same thing a few days ago. One of the most interesting takeaways from this war is how soft power is very underrated, and lack of any soft power whatsoever is one of the reasons behind Russia's problems.
However the only "soft power" that has actually worked for Russia are their hundreds of thousands of social media disinfo sockpuppet accounts. They have convinced half of India, Nigeria, Hungary and Kentucky that Ukraine created COVID-19.
To me soft power sounds more like culture - being appealing to other country's populations.
There's even a fun parallel to draw with the floating LNG terminals off the coast and WWII floating harbors for Normandy
And there is a whole diplomat generation standing by to be useful idiots again if not an example is placed like a statue every 3 generations.