Armenia vows 'grave consequences' after helicopter downed

Yerevan vowed 'grave consequences' Wednesday after Azerbaijani forces shot down an Armenian military helicopter, sparking fears of a major escalation of the longstanding conflict over Nagorny Karabakh.
The downing is the most serious military incident along the Karabakh frontier since the 1994 ceasefire that ended a bloody war that cost 30,000 lives over the disputed region.
Armenian media reported that the helicopter's three crew members were all killed.
"A MI-24 combat helicopter attempted to attack positions of the Azerbaijani army near (Karabakh's) Agdam district," Azerbaijan's defence ministry said in a statement.
"The helicopter has been shot down by the Azerbaijani army," it said, adding that the wreckage fell on territory held by ethnic Armenians.
Yerevan vowed that Baku will face "grave consequences", fuelling fears that the incident might seriously undermine a shaky peace.
"This is an unprecedented escalation and the consequences for Azerbaijan will be grave,” Armenia’s Foreign Ministry spokesman, Artsrun Hovannisyan, told AFP.
“Azerbaijan's claim that the Armenian helicopter attacked its positions is not true. Examination of the wreckage will prove that the helicopter carried no weapons,” he added.
The separatist defence ministry in Karabakh confirmed that its helicopter was downed by Azerbaijani forces "while conducting a training flight as part of military drills", adding that a firefight began after the incident and was continuing.
"The enemy is continuing to fire intensively in the direction of the site of the incident with small arms of various calibre," it said.
Since Thursday, Karabakh forces have been conducting joint drills with Armenia coordinated by the Armenian army chief-of-staff.
- Worse since Ukraine crisis -
Two decades after a ceasefire agreement ended their bitter war over Karabakh, Azerbaijani and Armenian forces regularly exchange fire across their frontier and along the Karabakh frontline.
Last August saw an unprecedented spiral of violence with more than 20 troops killed from both sides in the deadliest clashes since an overall ceasefire was agreed.
Armenian separatists backed by Yerevan seized the mountainous region, which is mainly inhabited by ethnic Armenians, from Azerbaijan in a war in the 1990s.
Despite years of internationally mediated negotiations, the two sides have not yet signed a final peace deal, with Karabakh still internationally recognised as part of Azerbaijan.
The peace talks are being brokered by the so-called Minsk group of mediators appointed by the OSCE in 1992 and co-chaired by France, Russia and the United States.
Oil-rich Baku, whose military spending exceeds Armenia's entire state budget, has threatened to take back the region by force if negotiations do not yield results.
Armenia, which is heavily armed by Russia, says it could crush any offensive.
Last month Europe made a fresh push to end the festering conflict.
Germany's Foreign Minister Frank-Walter Steinmeier visited both countries in October to facilitate a negotiated solution to the conflict.
French President Francois Hollande also hosted leaders from Armenia and Azerbaijan for Karabakh talks but the meeting ended without any breakthrough.
Tensions between Baku and Moscow-allied Yerevan are escalating as Russia confronts the West over Ukraine, where government forces are battling pro-Russian separatists.
"What happened in Ukraine has had a direct impact" on the Karabakh conflict, a source in Hollande's entourage said in October, adding that Russia's annexation of Crimea "exacerbated the climate".