Also: Vasili knows that Nina is the mole. He answered his own question in his head when he asked her, "Why now?"

The look on Elizabeth's face after she shot the guy was amazing. After being married for 35 years (and 8 months) and a spy for 23 years, this is how the KGB repays him. I wonder if Elizabeth sees the same end game, some time in the future when the KGB doesn't need her anymore.