From Berlin, Sir Nevile Henderson reported that he had told the Czechoslovak ambassador, Vojtech Mastny+˘, that Beneš had committed a fatal error in failing to transform the centralized unitary state into the Swiss model of cantons based on nationalities. Short of this unfeasible change, the only recourse would be a plebiscite, also unacceptable to Prague. Beneš, seeking rescue, had his minister to Paris, Osusky+˘, check out alternatives at the Quai d'Orsay with Foreign Minister Bonnet. Osusky+˘ said that a strong French response was key to the Czechoslovak decision. He continued: "If the French Government should declare that it has certain political or military interests in Czechoslovakia, and [that] it intends to defend them," such a statement would permit Prague to refuse the proffered British intervention, which prejudiced "the political and military independence of Czechoslovakia."71 On July 25th Bonnet counseled acceptance of the intervention without reservations or conditions. Beneš had no alternatives.72 He was isolated and accepted the British dictation. He issued the required official invitation to the already designated Lord Runciman in London.