On Friday, we previewed the battle for Aleppo, Syria’s largest city prior to the war.

It’s now run by a hodgepodge of rebels and militants including al-Qaeda, the Free Syrian Army, and ISIS and for the Assad regime, regaining control of the city is absolutely critical. As Reuters noted last week, "the assault means the army is now pressing insurgents on several fronts near Syria's main cities in the west, control of which would secure President Bashar al-Assad's hold on power even if the east of the country is still held by Islamic State."

In other words, if Assad can secure Aleppo, Iran and Russia will have successfully restored his grip on the country for all intents and purposes.

Here’s a look a map showing where Aleppo is in relation to Russia’s base at Latakia, along with the before and after images we highlighted last week which depict nighttime light emissions on the way to vividly demonstrating the effect the war has had on the city.