US coalition launches full-scale assault on Iran in response to cruise missile strikes from Houthi controlled territory on at least 20 Saudi oil refineries
Or alternatively for something less verbose:
Missiles from Houthi controlled territory strike 20+ Saudi oil refineries, US coalition responds with full-scale assault on Iran
I'd put the lede at the front:
US coalition launches full-scale assault on Iran in response to cruise missile strikes from Houthi controlled territory on at least 20 Saudi oil refineries
Or alternatively for something less verbose:
Missiles from Houthi controlled territory strike 20+ Saudi oil refineries, US coalition responds with full-scale assault on Iran