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Arena (Active Countermeasures System)The Arena Active Protection System (APS) is an active countermeasure system developed at Russia's Kolomna-based Engineering Design Bureau to provide anti-missile defense for T-90 tanks. It uses millimeter-wavelength radar to detect incoming projectiles, then fires a defensive explosive at the incoming round, timed to detonate immediately in front of the target. Arena was designed partly in response to vulnerabilities in T-80 and other tanks, discovered during fighting in Chechnya in the 1990s. It is intended to help protect a tank from light anti-tank weapons and ATGMs, including those with top-attack warheads. The system cost is approximately $300,000. External links
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