The U.S. State Department has approved the potential sale of Volcano anti-tank mine-laying systems to Taiwan for an estimated $180 million, the Pentagon said Wednesday.Taipei's de facto diplomatic mission in the United States had requested the vehicle-launched systems and other equipment amid increasing threats from China.Taiwan's Defense Ministry expressed "sincere gratitude" to the department for the approval in a Twitter post.The U.S. Defense Department notified Congress of the possible sale on Wednesday as required by law. Arms firms Northrop Grumman and Oshkosh Corp. will be the sale's…READ FULL ARTICLE