Cooperation. This column is a modest reaction today to the dramatic events in the sky over Ukraine on Thursday afternoon, highlighting the positive and encouraging aspects in the relations between the EU and Russia. This optimism has a triple advantage: (1) cooperation with Moscow is useful for Europe; (2) in several areas, it is founded on solid bases - even if speaking about this is often avoided; (3) the current Russian authorities are in favour of it (although some experts say that in Moscow...