Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: (CNN) US President Donald Trump has ordered the CIA to discontinue a program of arming and training anti-Assad rebels in Syria, according to a report in the Washington Post which cites unnamed US officials. The move is seen as controversial, given Russia's opposition to the rebels and Moscow's strong support for the regime of Syrian President Bashar al-Assad. "It's a strategic mistake.... (support for the rebels) was a pressure point on Assad and a pressure point on the Iranians... and the Russians," according to Bob Baer, CNN Intelligence and security analyst and former CIA operative. "It looks like, to me, that he just gave that as a gift to Vladimir Putin for no quid pro quo and that's not the way diplomacy works. We should've used this, we should've demanded, for example, safe zones so the Sunnis wouldn't get hit from the air... so this is just inexplicable, why he would do this.Kremlin says issue of US support for Syrian rebels didn't come up at Trump-Putin G20 meetingEnd of program wouldn't affect Pentagon's plans to support anti-ISIS rebel groups, report adds 
 Question:Since then those rebel forces have lost ground steadily, including losing control of parts of the city of Aleppo late last year, and have now been pushed into a corner by _ government forces.
Output:
Syria