AP Explains: The Looming, Final Battle for Syria's Rebels by Philip Issa – Associated Press
In a corner of northwestern Syria packed with nearly 3 million people, the government and its opponents are preparing for a final, bloody showdown.
The campaign for Idlib, the opposition's only remaining stronghold in the country and now a refuge for over one million displaced Syrians, is likely to be the last major theater of battle after seven years of brutal civil war.
It is also potentially the most dangerous.
The U.N. and aid workers are bracing for disaster, warning that up to 800,000 people are in danger of renewed displacement if a government offensive gets underway. A massive military buildup in nearby areas suggests an assault — at least to regain parts of the province — may be imminent.
Turkey, which backs the rebels in Idlib, has warned against a military solution and is reportedly negotiating with Russia in an effort to avoid a full-scale offensive.
Concern is mounting meanwhile over the potential use of chemical weapons, and the Russian navy is building up its presence in the Mediterranean Sea.
Here's a look at what lies ahead for Idlib…