|Submit a token of earth and water to your new Romulan masters... ;-)|
-Land support ships unfueled at your potentially compromised locations. W0 C+I sitting on a cluster of planets is a lot of fun.
-Mines, or webmines...
-Destroy them early
-Build 200/60 SB's with sufficient colonists and defense posts
-Control fuel depots
-Make them an ally
-See recommendation #1, preferably with Robot or Crystal help, and get them up early and often...