Armenian police detained 88 people at a protest in the capital Yerevan by demonstrators demanding the resignation of Prime Minister Nikol Pashinyan over his decision to cede several border villages to Azerbaijan.
Armenia said last month it would return the uninhabited villages in what both sides said was an important milestone as they edge towards a peace deal after fighting two wars since the collapse of the Soviet Union.
The decision has angered many in Armenia. Protesters led by a senior Armenian cleric reached Yerevan on Thursday after walking for several days from a village in the country's northeast, a distance of some 100 miles (160 km).
Archbishop Bagrat Galstanyan called for Prime Minister Pashinyan's resignation at rally of thousands of supporters, who he encouraged to begin acts of civil disobedience aimed at toppling the government.
Opposition parties in Armenia's parliament have said they will try to begin impeachment proceedings against Pashinyan, whose Civil Contract party retains a majority of lawmakers, and is unlikely to break with him.
Armenia is a treaty ally of Russia and traditionally Moscow's closest partner in the South Caucasus, but bilateral relations have sharply deteriorated in recent months as Yerevan has sought to build ties with the West, blaming Russia for failing to defend it from Azerbaijan.
President Donald Trump has stated on Monday that the US would either reach a deal with Iran or "finish the job", renewing his threat of military action.
At least eight people have been killed after thunderstorms battered central China's Hubei Province, state media said on Tuesday, as forecasters warned of more torrential rain across various parts of the country that are home to around 200 million people.
Hamas has announced on Monday that it had dissolved its de facto government in Gaza and was ready to hand over to a group of Palestinian technocrats, a move it described as a step forward in a US-backed plan for the enclave, but Israel dismissed as a "stunt".
The death toll from Venezuela's twin earthquakes has risen to 3,535, authorities said on Monday, while nearly 18,000 people remain homeless more than a week after the disaster struck the capital and nearby coastal areas.
Russia hammered Ukraine with missiles and drones early on Monday, killing at least 26 people and exposing Kyiv's critical shortage of US-made interceptors, officials said, just days after the deadliest attack on the Ukrainian capital this year.