Serbia

The weapons, which are illegal in Serbia, emit sound waves which can trigger sharp ear pain, disorientation, eardrum ruptures or even irreversible hearing damage.

A proposed lithium mine in Serbia is spurring protests over its potential impact on the environment. The mineral is in high demand because it’s crucial for the batteries that run electric vehicles.

Officials and state-controlled media have launched a major campaign against the rally, comparing it to the uprising in Ukraine that led to the fall of that country's then pro-Russia president in 2013.

The government declared a one-month amnesty period for citizens to surrender unregistered weapons as part of a crackdown on guns following the two shootings this month that left 17 people dead.

Serbian police said they arrested a suspect in a shooting attack that killed at least eight and wounded 14, the nation's second mass shooting in two days. Serbia's president vowed tough gun measures.

Flights filled up and ticket prices sky-rocketed, apparently driven by fears that Russia's borders could close or that a broader call-up might send many Russian men to the war's front lines.

A handful of fans waving the Serbian flag greeted Djokovic at the airport.

Some 5,000 refugees and migrants are in Serbia, trying to reach European Union countries. With EU leaders fearing an influx of refugees, "Serbia is in a difficult position," says a refugees' advocate.

Protesters gathered hours after an announcement that a curfew would be reinstated. Now President Aleksandar Vučić says it "probably" won't happen — despite an "alarming" surge in cases.

An annual survey by the watchdog Freedom House says authoritarian leaders and the influence of China and Russia are undermining democratic progress achieved since the end of the Cold War.