The phrase "air defence exercise" is correct and usable in written English.
It can be used to refer to a military training operation focused on air defense strategies and tactics.
Example: "The country conducted a large-scale air defence exercise to test its readiness against potential aerial threats."
Alternatives: "air defense drill" or "aerial defense training".
"The reason for the crash could be an unintentional hit by an S-200 missile during the Ukrainian air defence exercises," Mr Marchuk told a press conference today, adding that investigators would make their final conclusions after further, complex research.
While operating Sabres the squadron made a number of deployments to Darwin for air defence exercises which often involved RAF units.
No. 6 Squadron continued its training duties with the new aircraft; these included regular deployments to Darwin in the Northern Territory to participate in air defence exercises as well as training flights to Malaya and New Zealand.
He had used the device hundreds of times to record the positions of air defence systems deployed in training exercises.
While the squadron did not play an active role in the war, it supported the US effort by providing air defence for Ubon and taking part in exercises with USAF aircraft in which the Sabres adopted tactics used by North Vietnamese MiG-17 fighters.
The MoD said no final decision had been made to use the air defence systems.
A second senior official said the US intended to call on China to "exercise restraint" and "avoid any other destabilising actions", including a new declarations of air defence zones.
China's Soviet-built Liaoning aircraft carrier, returning from exercises in the South China Sea, was not encroaching in Taiwan's territorial waters but entered its air defence identification zone in the southwest, Taiwan's defence ministry said.
As part of the exercises, aircraft were to shoot at ground and air-based targets at newly opened testing grounds near Ukraine's south-east border, while air defence forces were to fire surface-to-air missiles near Astrakhan next to the Caspian Sea, the defence ministry said in a statement.
"So I added two Phantom air defence aircraft and an RAF Regiment Squadron to our defences.
