MOSCOW, Sept. 4 (Xinhua) -- U.S. President Donald Trump's warning to Syria and its allies not to attack Syria's rebel-held northwestern Idlib Province ignored the danger terrorists pose there, the Kremlin said Tuesday.

"Making some kind of warning without paying attention to the dangerous and negative potential of the situation in Idlib for the whole situation in Syria is not the fullest and comprehensive approach," Kremlin spokesperson Dmitry Peskov was quoted by TASS news agency as saying.

Trump tweeted Monday that a "reckless attack" on Idlib could result in hundreds of thousands of victims and warned Syria and its allies Russia and Iran against making a "grave humanitarian mistake."

The Syrian army, backed by Iran and Russia, has been amassing forces to launch a wide-scale offensive against what it calls ultra-radical groups in Idlib while at the same time trying to reach reconciliation deals.

Peskov said he was aware that the Syrian Armed Forces were preparing "a solution" for problematic Idlib, from where terrorists were sending drones to attack Russian military installations in Syria.

He said Idlib will be one of the main issues on the agenda of the Russia-Turkey-Iran summit to be held in Tehran on Friday.

Idlib, with a population of about 2.5 million, is strategically important as it shares a border with Turkey to the north, and also hosts a Russian-operated air base. It is to the coastal province of Latakia, home of Syrian President Bashar al-Assad.