The U.S. was considering eight potential targets in Syria, including airfields, a research center and a chemical weapons facility.

The world is bracing for the U.S. response to the Syrian government's alleged chemical attack last weekend on a rebel-held town. Since the attack, Trump tweeted about potential missile strikes multiple times.

President Donald Trump might have given Syrian and Russian forces too much time to prepare for potential air strikes, defense experts say.

President Donald Trump might have given Syrian and Russian forces too much time to prepare for potential air strikes, defense experts say. The world is bracing for the U.S. response to the Syrian government's alleged chemical attack last weekend on a rebel-held town. Since the attack, Trump tweeted about potential missile strikes multiple times. "If Russia and Syria were smart, as soon as President Trump indicated early this week that an attack was possible, [Syrian President Bashar] Assad would have begun moving any and all military assets close to or on Moscow's military bases in-country," Harry Kazianis, director of defense studies at the Center for the National Interest, told CNBC. "This would include aircraft, helicopters, artillery and even ammunition or high-value weapons—anything you might think the U.S. and its allies might consider a target."

A Russian Sukhoi Su-35 fighter lands at the Russian Hmeimim military base in Latakia province, in the northwest of Syria. Vasily Maximov | AFP | Getty Images

A source, who spoke on the condition of anonymity, told CNBC on Thursday that the U.S. was considering striking eight potential targets in Syria. Those targets include two Syrian airfields, a research center and a chemical weapons facility. The source also noted that Syria's military has repositioned a significant amount of air assets to Russian-controlled airfields in hopes that Washington would be reluctant to strike there. Meanwhile, Trump is seeking a large-scale attack in Syria that would also punish Iran and Russia, but Defense Secretary James Mattis has been pushing back, The Wall Street Journal reported Friday, citing administration officials. The following graphic from the Institute for the Study of War, or ISW, tracks the movements of military assets and personnel following a deadly chemical weapons attack believed to be carried out by the government of Syrian President Bashar Assad.

A map identifying key pro-regime military movements from April 8 – 12, 2018 following the deadly Syrian chemical weapons attack. Institute for the Study of War

According to the ISW report, Syrian aircraft located on the outskirts of Hama, Homs and Palmyra have relocated closer to heavily defended airfields across Syria. "Aircraft relocated from the Seen (Sayqal), Dumayr, Shayrat, and the T-4 (Tiyas) Air Bases to the Bassel al Assad International Airport in Latakia Province, the Nayrab Air Base outside Aleppo City, and the Damascus International Airport," the ISW report states. Russian and Assad regime forces have enhanced their air defenses around Syria's capital, Damascus, and deployed short- to medium-range surface-to-air missiles to the Mezzeh Military Air Base, as well as other sites in the city. "Pro-regime officials also reportedly issued an alert to the Syrian Arab Army to evacuate personnel and assets from military bases across Syria," the report notes.

Weapons research center reportedly evacuated

The Syrian Scientific Studies and Research Center, a government body responsible for research and development of advanced weapons systems, was reportedly evacuated amid potential strikes. In addition, Iranian proxies have reportedly begun exiting Syria.

Syrian and Russian soldiers wait at the entrance of the Wafideen Camp for the arrival of buses carrying Jaish al-Islam fighters and their family members evacuated from the Eastern Ghouta town of Douma, on April 12, 2018. Youssef Karwashan | AFP | Getty Images