The Attempted UN assassination of Chrisjen Avasarala was planned by Undersecretary Sadavir Errinwright after killing the MCR Defense Minister Korshunov.
To prevent himself from being exposed for treasonous actions Undersecretary Sadavir Errinwright destroys the Martian ship MCRN Karakum to prevent Mars from gaining Protomolecule Hybrids. Knowing that Deputy undersecretary Chrisjen Avasarala could expose him sent a message to Jules-Pierre Mao onboard the Guanshiyin telling him of this and ordering him to kill Avasarala. Mao escaped the ship and his crew attempt to kill Avasarala unsuccessfully as she was rescued by Bobbie Draper and they were able to escape with the ship's comm logs onboard the docked racing ship Razorback.
This would not the the end of the attempted assassination as a Leonidas-class battleship that had escorted Avasarala to the Guanshiyin then chased the Razorback firing missiles at the racing ship. Fortunately for the Avasarala a Martian Marine Corps distress signal sent out by Bobbie Draper was received by the Rocinante which fired and detonated missiles to create EMP bursts destroying incoming projectiles, as well as deploying PDCs. Rocinante then fired 5 missiles that detonated directly infront of the Leonidas-class blinding it's sensors temporarily. The Rocinante used this to fly directly past the battleship firing two missiles into its engines sheering two of them clean off and causing it to go into an uncontrollable spin. Razorback then docked with Rocinante.