Demchenko sidoo kale wuxuu ku guuleystay siddeed billadood oo ka tirsan FIL European Luge Championships oo leh afar dahab ah (Ragga keligood: 2006, 2010; Kooxda isku dhafan: 2012, 2014), laba lacag ah (Ragga keligood: 1996
, 2008), iyo laba dahab oo naxaas ah (Ragga labiska ah: 1996; Kooxda isku dhafan: 2013).