Dec 9 (Reuters) - U.S. President Joe Biden on Friday authorized fresh $275 million in military aid for Ukraine offering new capabilities to defeat drones and strengthen air defenses, according to a memo released by the White House. But details were scant on two systems, "counter air defense capability" and "Counter-Unmanned Aerial Systems equipment," which appear to be new capabilities for Ukraine. To counter these attacks, the United States has sent sophisticated anti-aircraft NASAMS systems to Ukraine which have been running for a few weeks. Washington previously announced that it was sending four Avenger short-range air defense systems that use Stinger missiles, made by Raytheon Technologies Corp (RTX.N), and HAWK interceptor missiles. U.S. allies have also been sending air defense systems.

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