When the drone ship was heavily damaged and left defenseless by a Rigellian scoutship, Vrax displayed concern that if the Vulcans were to capture the prototype drone ship, they would be able to trace the propulsion matrix back to the Romulans as the drone ship was a heavily modified warbird. Although Valdore assured Vrax that the ship would not be captured by anyone, Vrax warned Valdore that if the project failed, the senator would not be the one paying for the failure. He reinforced this message with his imposing Reman bodyguards.
After the drone ship was compromised by two members of the Enterprise crew, Vrax was informed through unspecified "sources" as to the developments and again visited the admiral in order to lay witness to the destruction of the Earth ship. The drone ship failed to destroy Enterprise, but was nonetheless able to evade capture or destruction. (ENT: "United")
Following these events, Tellarites and Andorians formed an alliance for the first time, causing Vrax immense concern as Valdore's mission was now having the opposite effect. Fearing for his own safety, Vrax began to believe his support of Valdore's plan was now a mistake and that Valdore's failures had severely weakened his position in the Senate.
The mission would ultimately fail completely as Enterprise was able to destroy the drone ships with the assistance of two Aenar, leaving both Valdore and Vrax at the mercy of the Romulan Senate. (ENT: "The Aenar")