Equipping Ukraine with a modern air force of Nato standards will take much longer. Crews have to be trained and ground crew teams of fitters and maintainers have to be recruited, trained and paid. Finding the right mix of ground attack and air defence aircraft is tricky. The F-16 is the most suitable, the Eurofighter Typhoons of the UK, Germany, Italy and Spain less so. Less prominent, but just as vital, are the needs to replace and update the forces of attack, transport and reconnaissance helicopters.