They plotted the killing of Borukhova's estranged husband.
Orthodontist Daniel Malakov was gunned down in a park in front of the couple's 4-year-old daughter.
The two were convicted last month of first-degree murder and conspiracy.
Prosecutors say Borukhova was distraught over temporarily losing custody. She hired her relative to kill Malakov for about $20,000 in October 2007.
Mallayev also was convicted of weapon possession - the gun and makeshift silencer used in the killing.
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