Valeria Poriskova was a Russian intelligence agent based at the Russian Embassy. She was Damian Rennett's handler with the FSB.
At some point, she came in contact with Gamine, a wanted cyber-terrorist, who instructed her to kill Hannah Wells. However, she ended up killing Damian instead.
In England, she is found by Hannah Wells and the two get into a fight. Hannah shoots her twice in the chest, killing her.