Is Lee Harvey Oswald Trying to Kill General Walker?

Oswald tells Marina to contact the Russian Embassy and let them know what happened to him, including sending any newspaper stories about him. That's suggestive of the idea that someone at the embassy may have been expecting news about him like he was on a mission for them. He then says that they will quickly come to your assistance on learning everything,. It could suggest that there's a prearranged deal to take care of Marina if something goes wrong with the mission.