What is this icon that Putin touches/kisses at monument of St.Vladimir?

The Russian Federation (along with some other Slavic nations), recently celebrated the 1,030th anniversary of the Christianization of the Rus' , which included a liturgy at the monument to Vladimir the Great near the Kremlin. In this video (time- 23:45), President Putin (followed by the Patriarch) is seen bending forward and touching/kissing some icon/relic encased in a gilded box. What exactly is this gilded box (or the item contained within it)? ---------------- Granted, since this event is also a tribute to St.Vladimir, I guess this is some relic associated with him? (I'm not entirely sure though.)