They are sending to prison russians who name their war in Ukraine war,so it is probably true.
They also fined a Priest for calling the War a War recently. Apparently repeated offenses can result in prison time.
Russian Orthodox Priest Fined For Condemning War In Ukraine
On March 10, a court fined the Rev. Ioann Burdin of the Moscow Patriarchate's Kostroma Diocese one month's average local wages for online remarks and a Sunday sermon in church condemning Russia's invasion of Ukraine and stressing the importance of the commandment, “Thou shalt not kill.”
religionunplugged.com