Novaya Russia
Objectives:
Destroy two out of three European Capitols.
Destroy the Rebel Capitol.
The second powerhouse of Modern units is the Artillery. Thanks to Civ upgrades, these beasts can easily get over 20 range (that's 3 times the range of the average unit), which effectively ignores a lot of level design that goes on in this map.
For the two capitols to destroy, I choose Yellow (Finland, I guess?), because they offer absolutely no resistance to my starting units and therefore require no effort, and Purple (Sweden?), because the artillery's range allows me to completely disregard their defenses. A squad of tanks safeguards some additional artillery to destroy the Rebels.
This mission does give a sneak peak to the worst part of speedrunning this game: enemy AI is completely unpredictable. In this mission, the two biggest random elements are a squad of Rebel tanks and AT guns, which could just destroy all my artillery (in this case they decided to attack my base instead), and whatever reaction yellow and purple have to my invasion. Yellow making a tank to destroy my artillery has never happened in any other attempt, but luckily it was too late to make a difference. The one artillery I lose does not slow down the destruction of the purple capitol.
Game time: 7:07