One cannot have economic growth without security.
If the EU and the US can cooperate successfully on regulating financial markets, everyone else will follow.
The European Union is the world's most successful invention for advancing peace.
When the E.U. and the U.S. agree, other countries follow.
David Cameron says he wants to keep Britain in the EU, but his tactics are so divisive that, if he gets what he wants it will be at the price of huge ill-will in Europe; or if he doesn't, it will be at the price of increased anti-EU sentiment in his own party and in British society.
It is not viable for one country to demand a right to increase and upgrade its nuclear weapons capabilities while asking others to eliminate theirs.