Exactly because Mars is Yan Fei's defense core, he did not build large-scale defense weapon arrays on Earth. However, to monitor Earth, he will build weapon turrets on the Moon aimed at Earth. Then, on the outskirts of the Asteroid Belt, Jupiter's Satellites, Saturn's Satellites, and other strategically important planets, he will construct powerful energy turrets. If there is indeed an invasion by foreign enemies, these weapon turrets will serve as defense arrays to protect Mars and Earth. Even if they cannot completely stave off the enemy invasion, they can at least buy Yan Fei time to evacuate personnel from Earth and Mars, avoiding significant losses to Earth humans.
Therefore, in the following period, Yan Fei went full force, starting to build various weapon platforms within the Solar System, crafting his own defense system...
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