A Russia-led security alliance of ex-Soviet states will send peacekeeping forces to Kazakhstan, Armenia's prime minister said on Thursday, after the Kazakh president appealed for their help in quelling violent and deadly protests.

Armenian Prime Minister Nikol Pashinyan said on Facebook that an unspecified number of peacekeepers would go to Kazakhstan for a limited period to stabilise the situation after state buildings were torched and the Almaty international airport was seized.

Eight police and national guard troops were killed in the unrest on Tuesday and Wednesday, Russia's state-owned Sputnik agency quoted the...