The Russian Ruble has destabilized a bit in recent weeks, as inflation and interest rates continue to rise.
It's worth watching, as it may be a sign that the costs of the war and sanctions are starting to have a meaningful impact on the Russian economy.
The Russians do not have infinite time to achieve their objectives in Ukraine. If they cannot force the Ukrainians to capitulate within the next year or so, it will start becoming difficult for the them to sustain the war without sacrificing their domestic economy in the process.