Dramatic irony and subterfuge
Subterfuge is what SMERSH is attempting, because the organization is hoping to attain their desired effect by deceit and espionage. By placing undercover agents throughout James Bond's path, the Russian operatives seek his demise and his death. They understand that these English agents are particularly resourceful and clever, so they even go an extra step, disguising some operatives rather clumsily so they will be caught, giving a false sense of security. The use of subterfuge is literally dramatic irony.
The femme fatale's irony
Although Romanova represents the ultimate antagonist, a deceitful woman aimed at Bond in the attempts of luring him to his demise, she actually transforms into his companion. Instead of being destroyed by the femme fatale, James Bond so allures her and impresses her that he earns her loyalty and faith. He makes her into a companion, a signal to the reader that he is supremely powerful in the game of espionage.
The death of a Russian
When they board the train, Nash quickly identifies three enemies of the state undercover. They think they have the upper hand, but when they discover that someone else has executed one of the operatives, they realize that the most dangerous undercover agents are still at large; this is a use of dramatic irony, because they discover a dead body that they didn't expect, and also situational irony, because Russians are killing their own team to prevent the spread of information.
Conspiracy and irony
There is an abstract irony that shapes James Bond's life. He wants to be close to someone, and he is friendly with women, but he is always up against the likelihood of conspiracy. Ironically, he trusts one person and that person was least trustworthy of all; he is uniquely afflicted by conspiracy. In other words, what would be perhaps unhealthy for some (absolute paranoia) is necessary for Bond's very survival. He is correct to be paranoid.
The bomb
Because of the ironic tendency of Bond villains to monologue, James Bond and company are able to correctly maneuver in response to a bomb threat that they didn't know about. Although dramatic irony had concealed it from their knowledge, they now know because of the ironic tendency among villains to be so egotistical that they need the attention and validation of Bond in their defeating him. The villain shows his hand to Bond, making the most dangerous moment in the story the most insightful as well.
