Nor clear purpose on what to do if it works, or any overall goal really. He just wants the robot.
I think the president is hot. Must be the epaulettes.
A cease fire would imply that Dracula sees Doc as a threat.
Considering that Dracula helped out the earth I think they are on more or less friendly terms. As in Dracula doesn't really care about him but he'll fire off a spare laser beam of ultimate destruction for him if he feels like it. Maybe not for Doc specifically, because that whole not telling him the secrets of the afterlife has him a little peeved. But if it's really important, he'll say "Fine. Today I was just going to blow an asteroid up with it anyway, you can have one."