Masliev and Kalintsev’s “Do Not Lament Me”

“Do Not Lament Me, O Mother” is appointed to be sung at the Divine Liturgy on Great and Holy Saturday (the same text appears in the Canon at Matins of the Lamentations). I haven't been able to unearth any information on this particular setting or its composers, but it's my impression that it’s a contemporary composition. You can hear a church choir in Russia singing it in Slavonic in this YouTube video.