It was a corporate coup d’état, and it was implemented with military precision. With little fuss or fanfare, Proventus Capital Partners, a Swedish investment giant led by the billionaire tycoon Robert Weil, simply seized control of a Dublin aircraft leasing business through the appointment of a share receiver. Montrose Global Aviation Leasing is a small player in a big industry, but still has a $100 million balance sheet and clients all over the world. However, in April, Proventus began the process of flooding the boards of its subsidiaries and restricting access of its owners to various bank accounts. Proventus was…