YEREVAN (QHA) - Hundreds have rallied in Yerevan to protest Armenia's decision to join a Russian-led Customs Union, as Russian President Vladimir Putin begins a visit to the country, RFE/RL informs. The protesters held posters saying, "STOP-Russia," "Putin, Go Home!" and "Serzh, Go Away!" Police blocked the protesters' way toward the presidential palace, saying their protest action on December 2 was unsanctioned. Police in Yerevan detained several leading anti-Russian activists before the rallies started. Putin arrived on December 2 in the northern city of Gyumri, where he will visit a Russian military base, attend a business forum, and attend a ceremony to launch a new section of the Razdan power plant. He will later leave for Yerevan to discuss the Customs Union of Russia, Belarus, and Kazakhstan with his Armenian counterpart, Serzh Sarkisian.