Syria regime 'seeking to sabotage' Turkey-Russia deal: Erdogan

Clashes in Idlib province in northwestern Syria have killed at least 42 fighters in 24 hours, a monitor said on Monday, and the regime bombardment on the region has devastated health services.

Idlib's 3 million inhabitants are supposed to be protected by a buffer zone deal signed last September by Russia and Turkey.

Erdogan told his Russian counterpart, Vladimir Putin, during a phone call late on Monday that the offensive by President Bashar al-Assad's forces "sought to sabotage Turkish-Russian cooperation", according to Fahrettin Altun, communications director at the Turkish presidency, on Twitter.

The readout of the phone call made no mention of the fact that Russian forces are involved in the Syrian offensive.

Russia and Turkey are on opposing sides of the conflict, with Moscow strongly supporting Assad, while Ankara has supported Syrian rebels.

The two countries have, however, worked closely, along with Iran, to find a political solution to the conflict.

Erdogan lamented that "the regime's ceasefire violations targeting the Idlib de-escalation zone over the last two weeks have reached an alarming dimension".

He said it was impossible to explain it as a counter-terror effort given the huge number of civilian casualties and widespread destruction of medical facilities.

The Turkish leader also warned that the attacks risked undermining the fate of the political process in Syria.

Hayat Tahrir al-Sham (HTS), Syria's former Al-Qaeda affiliate, controls most of Idlib province as well as parts of neighbouring Aleppo, Hama and Latakia provinces.

The Syrian Observatory for Human Rights said 16 regime and 19 rebels died between Sunday and Monday in clashes in the area of Jabal al-Akrad in Latakia province, which lies on the bastion's northwestern edge.

Russian and regime aircraft bombarded the area on Monday, while they also hit southern parts of the HTS stronghold, said the UK-based war monitor.

HTS and its allies launched a counter-attack late Monday, bombing areas in the north of the province and sparking fierce clashes on the ground, according to the observatory.

The civil war in Syria has killed more than half-a-million people and displaced millions since it started with the brutal repression of anti-government protests in 2011.