The Red Cross reminded all sides to the conflict that they have an obligation to respect the rules of international humanitarian law.

As conflict returns to the Caucasus, regional analyst Dennis Sammut warns of the danger of an escalation of what is already an explosive situation

Both Armenia and Belarus are members of the Collective Security Treaty Organisation and the Eurasian Economic Union. Azerbaijan is a member of neither.

Russia hints Azerbaijan is to blame for recent violence on the frontline

Fighting continued in the Karabakh conflict zone on Sunday morning despite Russian attempts to broker a cessation of fire, according to Armenian and Azerbaijani sources. The fighting is concentrated around some territory that was retaken by Azerbaijan on Saturday following the most serious clashes between the two sides since 1994.

World leaders call on Armenia and Azerbaijan to show restraint and for respect of the ceasefire agreement between them following the most serious clashes between forces of the two countries since 1994. Leaders of the UN, the OSCE, the EU and NATO were among those issuing statements calling on both sides to desist from further violence after fighting on Saturday killed dozens of soldiers and civilians

The BBC is reporting that there was more firing across the frontline overnight into Sunday, but no deaths were reported.

The Presidents of the two countries met their respective National Security Councils on Saturday evening shortly after both returned from a summit in Washington.

Fighting broke out overnight, with both sides claiming casualties

Updated: An Azerbaijani helicopter has been hit, according to the Armenian defence ministry. Azerbaijan denies the claim.