This is how Ukrainians and other Slavs greet each other after the Divine Liturgy on Palm Sunday. They do this while tapping each other with blessed willow branches that represent the branches used to welcome our Lord during His entrance into Jerusalem the week before his Passion.
Palm Sunday Troparion (Tone 1) O Christ God, when You raised Lazarus from the dead, before the time of your passion, you confirmed the future resurrection of all. We too, like the children of old, carry before You the symbols of your triumph and victory and cry out to You, the Conqueror of Death: "Hosanna in the highest! Blessed is He who comes in the name of the Lord!"