New Contract (Perimeter Defense Book #3) LitRPG series

The enemy’s at the gate, busy seizing Terran and allied star systems. The situation is getting worse by the second. The star system Unatari - the seat of Crown Prince George - is under threat from the Aliens. It’s high time Ruslan came back in order to rescue everything he holds dear from imminent destruction and save Perimeter Defense - the game that has become his life.
Realizing he can't stop the enemy with brute force, Ruslan asks the Swarm to send some of their starships to attack the Aliens' home planets, thus forcing them to turn back in order to protect them. The problem is, the Swarm Queen doesn't like the plan: this sentient insect refuses to believe that Ruslan can win. Which leaves our hero with only one option: to prove his ability to command a united fleet of galactic races, then face the Alien armadas in one decisive battle.