My concern with Obama is that he could be over-militaristic, to show he's tough, not under.
He's never served after all has he? Blair looked like he would be kind of soft, and took us into more wars than any prime minister in decades.
That aside, am I correct the aids-bomb thing was a joke? The Russians and Chinese are doing nothing of the kind, a nuclear bomb would vapourise any biological material attached to it instantly and anyway infecting your enemies with a weapon that takes years to kill them would be imbecilic in this context.
That and Russia would be far more likely nowadays to wage economic war IMO if it wanted to get nasty, China likewise.