During Alexei Navalny's (Russian Orthodox) funeral on March 1, 2024, multiple photos show the pallbearers wearing the same red-black-red armbands on the left arm, as seen here, here, and here, for instance.

Looking back, it seems that the (military) pallbearers during Gorbachev's funeral also wore similar armbands, but in this case those were black-red-black, as seen here.

I am aware that plain black armbands are sometimes used as a sign of mourning, but I could find no reference to the red color.

Is this typical for (Russian) Orthodox funerals or is this a political/cultural/regional thing? What is the significance of the red color specifically? Do they have a specific name, and what is their origin?

During Alexei Navalny's (Russian Orthodox) funeral on March 1, 2024, multiple photos show the pallbearers wearing the same red-black-red armbands on the left arm, as seen in Photos: Crowds attend Navalny funeral as Kremlin warns against protests, In pictures: Defiant Russians gather for Alexei Navalny's funeral, and Funeral of Alexei Navalny in Moscow – in pictures, for instance.

Looking back, it seems that the (military) pallbearers during Gorbachev's funeral also wore similar armbands, but in this case those were black-red-black, as seen In Photos: Gorbachev Laid To Rest After Moscow Funeral That Putin Didn’t Attend.

I am aware that plain black armbands are sometimes used as a sign of mourning, but I could find no reference to the red color.

Is this typical for (Russian) Orthodox funerals or is this a political/cultural/regional thing? What is the significance of the red color specifically? Do they have a specific name, and what is their origin?