As reported by Censor.NET, this was written by Main Military Prosecutor of Ukraine Anatolii Matios on Facebook.
"We are raiding the premises belonging to co-owner of Kurchenko's trust fund Mr. Koshel, who was detained recently while making attempt to travel to Poland. It's not a question of what we will find there. Th question is who and for what kind of merits has granted him this dagger that has just been found on him as he was searched? There is an engraving on it: 'The Security Service of the President of the Russian Federation'," he wrote.
"I will not be ironic. Such engravings are probably not made and gifts are not presented just for anything. The detainee has been living among us all the time - during and after all deaths of our compatriots. He has been trying to escape and has been caught. The prosecutor general has been working together with us around the clock all these days (seeking justice - of that I am sure) as an ordinary prosecutor. It's really inspiring!" Matios noted.