How is our message amplified? I could equally claim the UK position is diminished, subsumed within an EU voice. For instance do you know for a fact that we didn't call for more severe actions but were limited to agreeing to a consensus EU position?
Some EU countries may want fewer sanctions some more, how do you know that we arrived at an overall harder position?
How many times have we blocked the rest of the EU from taking a Foreign policy decision against our interests? And I take it 27 other EU countries can block our Foreign policy interests.
This "Outside of the EU our policy on any issue of international security is weaker " is obviously rubbish. We would never get EU consensus on deploying our armed forces in numerous conflicts or situations only as an independent nation can we truly act in our national interest.
It's amplified because it represents the voices of 28 states rather than one. This should be obvious to even the most casual observer. We do not need EU consensus to deploy armed forces, but when we want to amplify our voice on any issue we are able to use our membership of the UN, NATO and the EU to do so.
We are able to implement unilateral sanctions on individuals and their assets. These sting more from a bigger player like the UK but we are also able to push EU-wide sanctions at the European level. We have two avenues of attack. It is not obviously rubbish it is a hard political fact. We have more sway over smaller EU states because we retain a unilateral military capability comparable only to France. Our ability to limit EU policy is greater than the EU's to curtail our own. I'm not sure this has actually happened because on foreign policy we are, by and large, pulling in the same direction to common ends. Yet I see no point in removing the option.