Months after the start of the offensive and despite heavy bombardment, Assad regime fighters have failed to make significant advances against a determined opposition force.
The US request comes after Trump has repeatedly urged Berlin to increase its defence spending, last month calling Germany "delinquent" over its contributions to NATO's budget.
Following attacks, Ankara has retaliated with a measured response and warned the regime of severe 'punishment' if its forces are targeted again in future.
Aliaa is now living in sanctuary after a brutal journey that nearly killed her.
Turkish Defence Ministry says the Syrian regime attacked an observation point which was established after an agreement between Turkey and Russia to protect civilians from attacks in Syria.
Russian news agencies quoted military sources on Wednesday as saying Ankara and Kremlin agreed on a ceasefire in the de-escalation zone of the governorate of Idlib in north-western Syria.
The missiles targetted Tal al Hara sector located near the Israeli-occupied Golan Heights, according to regime-run SANA news agency, which reported no casualties.
Abdul Baset al Sarout had long been in the crosshairs of the Syrian regime for his songs of freedom.
The Russian-backed Syria regime has been pressing an assault on opposition and rebel strongholds with air attacks and ground battles which have already forced tens of thousands to leave their homes.
We visit one family whose home was destroyed in one of the attacks carried out by the regime.
As violence in parts of Syria's northwest escalates, civilians in western Aleppo are building up their defences.
The Serbian Orthodox Church leader Patriarch Irinej makes a controversial visit to Syria and praises Bashar al Assad.
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