The comment you replied to does not refer to WWI nor Russia's war with Ukraine, it refers to the Russian Revolution after WWI. It sarcastically indicates that "nothing" can be done now about the unjust state of Russia resulting in Navalny being a political prisoner.
The comment you replied to refers to the Russian Revolution after WWI. The damage inflicted by WWI greatly damaged the Tsarist regime. (And, no war, no German government shipping Lenin back home.)