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Trump is warning Russia to get ready for a US missile strike on Syria — here's what's happened over 7 years of conflict

Business Insider Logo By Ben Brimelow of Business Insider | Slide 1 of 27: Saturday's suspected  chemical attack in the Syrian city of Douma has reportedly killed up to 40 people and put new focus on the already seven year-long Syrian Civil War. The conflict has reportedly claimed the lives of as many as  half a million people, caused the worst refugee crisis since WWII, and destroyed so many cities and so much infrastructure that the cost to rebuild is an estimated  $200 billion. What started as street protests turned into a civil war, and has now erupted into a war that involves dozens of nations (directly or indirectly), hundreds of armed groups, and four main sides.Despite all that, the war continues - and shows no real signs of stopping anytime soon. Take a look here at how the conflict unfolded:Veronika Bondarenko contributed to a previous version of this story.

Saturday's suspected chemical attack in the Syrian city of Douma has reportedly killed up to 40 people and put new focus on the already seven year-long Syrian Civil War.

The conflict has reportedly claimed the lives of as many as half a million people, caused the worst refugee crisis since WWII, and destroyed so many cities and so much infrastructure that the cost to rebuild is an estimated $200 billion.

What started as street protests turned into a civil war, and has now erupted into a war that involves dozens of nations (directly or indirectly), hundreds of armed groups, and four main sides.

Despite all that, the war continues - and shows no real signs of stopping anytime soon.

Take a look here at how the conflict unfolded:

Veronika Bondarenko contributed to a previous version of this story.
© Reuters

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