ISTANBUL (Reuters) - Turkey is sending Syrian rebel fighters to support Azerbaijan in its escalating conflict with neighbouring Armenia, two Syrian rebels have said, as Ankara pledges to step up backing for its majority-Muslim ally.
The clashes over the territory of Nagorno-Karabakh are the heaviest since 2016, with reports of dozens of deaths and hundreds wounded.
Armenia's ambassador to Moscow said on Monday that Turkey had sent around 4,000 fighters from northern Syria to Azerbaijan and that they were fighting there, an assertion denied by an aide to Azerbaijan's President Ilham Aliyev.
Armenia also said Turkish military experts were fighting alongside Azerbaijan in Nagorno-Karabakh, a mountainous breakaway region of Azerbaijan run by ethnic Armenians, and that Turkey had provided drones and warplanes.
Azerbaijan denied the reports. Turkey did not immediately comment, although senior officials including President Tayyip Erdogan, who has increasingly been flexing Turkey's military muscle abroad, have promised support for Baku.
The two fighters, from Turkish-backed rebel groups in areas of northern Syria under Turkish control, said they were deploying to Azerbaijan in coordination with Ankara.
They declined to be named because of the sensitivity of the issue. Reuters could not independently verify their accounts.
"I didn't want to go, but I don't have any money. Life is very hard and poor," said a fighter who had fought in Syria for Ahrar al-Sham, a group that Turkey has supported.
$1,500 A MONTH
Both men said they had been told by their Syrian brigade commanders they would earn around $1,500 a month - a large wage for Syria, where the economy and currency have collapsed.
The fighter said he had arranged his assignment with an official from the Turkish-backed Syrian National Army (SNA) in Afrin, a region of northwest Syria seized by Turkey and its Syrian rebel allies two years ago.
A spokesman for the SNA, an umbrella group of Syrian rebel groups backed by Turkey, did not respond to a request for comment.
The other fighter, from the SNA-affiliated Jaish al-Nukhba militia, said he had been told nearly 1,000 Syrians were set to be deployed to Azerbaijan. Other rebels, who also declined to be named, gave figures of between 700 and 1,000.
The two men, who spoke to Reuters last week, said they expected to be despatched on Sept. 25, to guard facilities but not to fight. Reuters was not able to contact them on Monday to confirm their location.
Hikmat Hajiyev, a foreign policy aide to Azeri President Ilham Aliyev said it was "complete nonsense" to say Syrian fighters were coming to help his country: "Our armed forces have more than enough personnel and reserve forces."
In recent years, Turkey has projected growing power abroad with incursions into neighbouring Syria and Iraq, and military support for the internationally recognised government in Libya.
Turkey has repeatedly said it is also ready to provide support to Azerbaijan, with which it has strong historical and cultural ties and runs joint energy projects.
RIVALRY WITH RUSSIA
Defence Minister Hulusi Akar attended joint military drills in Azerbaijan in August, and Erdogan used his speech to the United Nations General Assembly last week to accuse Armenia of attacking its neighbour.
Concern that Turkey could get more involved in the conflict helped drag its currency to a record low against the dollar on Monday.
Mustafa Sejari, a senior Syrian rebel, did not confirm the deployment of fighters to Azerbaijan but said Turkey was the "only hope" left for opponents of Syrian President Bashar al-Assad, who has retaken most rebel-held land in Syria with Russian and Iranian support.
"Our alliance with (Turkey) takes different forms and is truly a common fate," he said. "I don't rule out at all Turkey becoming a strategic choice for Syrian youths."
Turkey has already used Syrian fighters to help block an assault on the Libyan capital Tripoli earlier this year by General Khalifa Haftar's eastern-based Libyan National Army, backed by Russia among others.
Their use in Syria would create a third theatre for Turkey's regional rivalry with Moscow, which has a military base in Armenia, considers it a strategic partner in the South Caucasus, and supplies it with weapons. It has not commented on the reports of Syrian fighters being sent to Azerbaijan.
Kremlin spokesman Dmitry Peskov said Moscow was following the situation very closely and that the conflict had to be resolved through diplomacy.
(Additional reporting by Nailia Bagirova in Baku and Suleiman al-Khalidi in Amman; Writing by Dominic Evans; Editing by Mike Collett-White and Kevin Liffey)