http://www.bbc.com/news/world-middle-east-34907983"Turkish warplanes have shot down a Russian military aircraft on the border with Syria.
Russian President Vladimir Putin said the Su-24 was hit by air-to-air missiles fired by Turkish F-16s while it was flying over Syrian territory.
But Turkish military officials said the plane was
engaged after being warned that it was violating Turkish airspace. .........."
What does "engaged" mean in that sentence? 