In recent weeks, the U.S. military has mounted an operation to temporarily disrupt what is described as the world’s largest botnet — one used also to drop ransomware, which officials say is one of the top threats to the 2020 election, the Washington post reported. U.S. Cyber Command’s campaign against the Trickbot botnet, an army of at least 1 million hijacked computers run by Russian-speaking criminals, is not expected to permanently dismantle the network, said four U.S. officials, who spoke on the condition of anonymity because of the matter’s sensitivity. But it is one way to distract them at least for a while as they seek to restore operations. The effort is part of what Gen. Paul Nakasone, the head of Cyber Command, calls “persistent engagement,” or the imposition of cumulative costs on an adversary by keeping them constantly engaged.