US President Barack Obama says he will remain “cautious” about a ceasefire in war-ravaged Syria, citing the “difficult” situation in the country.

Obama made the comments after a meeting with Jordan's King Abdullah II at the White House on Wednesday.

The ceasefire, which was set to start on Saturday, was announced after negotiations between Russia and the US, both of which have been engaged in airstrikes in the Muslim country.

"We are very cautious about raising expectations on this," Obama said. "The situation on the ground is difficult."

At the end of the road, efforts by Russia and the US are supposed to bring the focus of the complicated war to Daesh Takfiri terrorists, which the US president described as "something that right now they… are not focused on."

Washington and some of its allies have been conducting airstrikes against what they call Daesh positions in Iraq and Syria.

Obama sounded more optimistic later, saying, “We have seen modest progress over the course of the last week or so with respect to humanitarian access to populations that are threatened.”

Potential “lessening of the violence” following the truce, could bring about “the basis to build a longer term ceasefire,” he added.

The Jordanian king, for his part, voiced optimism about “the level of support from the United States,” stressing that with Washington at helm “the future looks much better.”

Described by Obama as a country that "punches above its weight when it comes to the fight against ISIL," Jordan is where the terrorists were initially trained by the CIA in 2012 in an attempt to finally bring down the Syrian government.

According to Bloomberg, the United States has so far provided $4.5 billion to the small country that also hosts many Syrian refugees escaping from violence towards the borders.

"No country other than the United States has given us so much," said Abdullah (pictured above).

As the ceasefire was set to begin, fears remained over violations that could trigger further escalation.

After the meeting, White House spokesman Josh Earnest said he expects there "will be some violations.”

"It will be unclear after a few days, or maybe even after a few weeks, about whether or not this understanding will stick," Earnest said.

Russia, which has also been conducting airstrikes on Daesh positions for a ehile, says it is engaged in “specific and complicated practical work towards the peace settlement.”

“We expect that our American colleagues start taking specific steps instead of talking as soon as possible,” Defense Ministry spokesperson Major General Igor Konashenkov told a media briefing earlier in the day.

Since the ceasefire does not include Daesh (ISIL), al-Nusra Front, and other terrorist groups, “Therefore the Russian Air Force is continuing airstrikes against these international terrorist groups’ targets as usual,” said Konashenkov.

According to New York-based political analyst Joe Lauria, “The United States is losing this war and Obama has a choice whether he is going to join and destroy ISIS (Daesh) with the Russian coalition and supporting the Syrian army.”

US Secretary of State John Kerry said earlier that that US and Russian officials would meet to form a task force to monitor the implementation of the truce.

"I talked this morning with (Russian) Foreign Minister Lavrov and we have a team that will be meeting in the next day or so," he said."I'm not here to vouch that it's absolutely going to work, but this is the one way that we can end this war... The alternative is that the war gets worse, that Syria might be totally destroyed, not able to be put back together again."