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Nuclear Security Summit

Tensions run high between Azerbaijan, Armenia despite truce

More than two decades after a conflict killed about 30,000 people and displaced 1 million others, tensions between Armenia and Azerbaijan over the region of Nagorno-Karabakh have exploded again, with both sides engaged in artillery duels, rocket barrages and tank attacks.

A cease-fire declared Tuesday after three days of intense battles raised hopes for restoring calm to the area in the South Caucasus mountains. But fears loom of a possible escalation in fighting, with Turkey strongly backing Azerbaijan and Russia obliged to protect Armenia by a mutual security pact.

Clashes that began over the weekend marked the worst violence since a separatist war ended in 1994 and left...