"Obama was referring to the roughly 200 B61 nuclear bombs that the US has deployed in five Nato nations stretching from the Netherlands to Turkey - and a Russian arsenal estimated at 2,000 tactical weapons."
" ... The same goes for tactical nuclear weapons: compared
to the momentous issues that the East and West have
tackled since the end of the Cold War, the scattering of
hundreds (or in the Russian case, thousands) of battle-field weapons throughout Europe seems to be almost
an afterthought, a detail left behind that should be
easy to tidy up."