No person other than the issuer shall commence a tender offer for or a request or invitation for tenders of, or enter into any agreement to purchase or exchange securities for, or otherwise seek to acquire, or acquire, in the open market or otherwise, or solicit proxies relating to, any voting security of a domestic insurer or of any corporation controlling a domestic insurer if, after the consummation thereof, such person would, directly or indirectly (or by conversion or by exercise of any right to acquire), be in control of such insurer, and no person shall enter into an agreement to acquire control of a domestic insurer or of any corporation controlling a domestic insurer unless, at the time any such offer, request, or invitation is commenced or any such agreement is entered into, or any such solicitation is begun, or prior to the acquisition of such securities if no offer or agreement is involved.