Note: the Russian word “provocatsiia” is often translated as “provocation” which is not incorrect as long as you are aware that in Russian “provocation” can mean “false flag”, as it does in this context. Putin is clearly warning about a false flag “sacrifice”.
As for the “liberal” or “democratic” “non-system” opposition it has already announced that it will convert the planned protest into a memorial rally .... http://russia-insider.com