Turkey - which has increased arms supplies to Azerbaijan in recent years - is likely to refrain from deeper military intervention if its ally continues its offensive in Nagorno-Karabakh, Reuters reported, citing military analysts. 

According to them, Russia, which has a defense pact with Armenia, also has good relations with Azerbaijan, is unlikely to take direct military participation if Azerbaijan does not deliberately attack Armenia.

Russian political scientist Fyodor Lukyanov believes that Russia's participation is unlikely to be similar to the support it provided in eastern Ukraine, and even an 'accidental hit' on the territory of Armenia will not be viewed by Moscow as 'aggressive actions.'

Moscow has a pragmatic relationship with Ankara, which has overcome past crises, and both countries are concerned about the safety of oil and gas pipelines in Azerbaijan.

However, Pierre Razoux, academic director at France’s Mediterranean Foundation of Strategic Studies believes that a deeper Russian intervention will be possible if Azerbaijan attacks Yerevan or the Russian military base in Gyumri.

Turkey’s support for Azerbaijan has had “a game-changing effect,” said Laurence Broers, Caucasus programme director at the Chatham House think-tank.

“If the Azerbaijani advance proceeds as it has to date, there won’t be a need for further Turkish involvement,” he said, adding that Turkey “would probably lend increased support” if Azeri advances stalled.