In Casino Royale, M is visibly angry and upset after Bond blows up an embassy. She mentions missing the Cold War, in the quote below. What about the Cold War does she miss?
M: Who the hell do they think they are? I report to the Prime Minister and even he's smart enough not to ask me what we do. Have you ever seen such a bunch of self-righteous, ass-covering prigs? They don't care what we do; they care what we get photographed doing. And how the hell could Bond be so stupid? I give him double-O status and he celebrates by shooting up an embassy. Is the man deranged? And where the hell is he? In the old days if an agent did something that embarrassing he'd have a good sense to defect. Christ, I miss the Cold War.