REUTERS Ukraine&#39;s state-run military-industrial concern Ukroboronprom reports that the website of Ukraine&#39;s largest aircraft manufacturer, state-run Antonov, was once again penetrated by hacker in another cyberattack. "The corporate website of the Antonov SE has been shut down following yet another cyberattack. Any reports that are distributed by www.antonov.com starting April 19 are fake. Thank you for your understanding," the company said with reference to Antonov&#39;s press service. In this regard, Ukroboronprom says the attackers are making a deliberate attempt to discredit Ukraine&#39;s leading aviation enterprise. As UNIAN reported earlier, Ukraine&#39;s largest aircraft manufacturer, state-run Antonov Enterprise on January 18 reported a cyberattack on its website where a fake letter criticizing the Ukrainian government and its head, Prime Minister Volodymyr Groysman, was posted.