Space militarization refers to the expanding use of outer space for military purposes, including satellite-based intelligence, surveillance, reconnaissance, navigation, and communication systems that are integral to contemporary warfare. Although space has been militarized since the Cold War era through the deployment of passive military satellites, the development and testing of anti-satellite (ASAT) weapons represent a significant shift toward the potential weaponization of space. This transition raises serious concerns regarding conflict escalation, strategic instability, and long-term environmental hazards in Earth’s orbital regions. ASAT weapons encompass a broad spectrum of technologies designed to degrade, disrupt, or destroy satellites. These include kinetic systems such as direct-ascent missiles and co-orbital weapons, as well as non-kinetic methods involving electronic jamming, cyberattacks, laser interference, and other directed-energy techniques. To date, four nations namely the United States, Russia, China, and India have demonstrated destructive ASAT capabilities through satellite interception tests. Notable incidents include tests conducted by the United States (1985, 2008), China (2007), India (2019), and Russia (2021). Such tests generate persistent orbital debris, significantly increasing the risk of the Kessler syndrome, a cascading collision effect that could render low Earth orbit increasingly hazardous or unusable for both civilian and military operations. International governance frameworks addressing ASAT weapons remain inadequate. The 1967 Outer Space Treaty prohibits the placement of weapons of mass destruction in orbit and restricts military activities on celestial bodies but permits conventional weapons and does not ban ground-based ASAT systems. Recent initiatives, including the U.S.-led moratorium on destructive direct-ascent ASAT testing announced in 2022 and endorsed by over 37 nations, along with related United Nations resolutions, seek to limit debris-generating activities. However, the absence of a comprehensive and legally binding international ban, coupled with stalled negotiations on the Prevention of an Arms Race in Outer Space (PAROS), continues to pose significant challenges to maintaining the peaceful and sustainable use of outer space.