Vladimir Putin has called an armed rebellion led by the Wagner mercenary group chief a “betrayal”, and has promised to “defend the people” and Russia.The Russian president addressed his nation on Saturday morning (23 June) after mercenary chief Yevgeny Prigozhin and his troops reached a key Russian city.Mr Prigozhin, the owner of the Wagner private military company, claimed that his forces now control military facilities in Russia’s southern city Rostov-on-Don."This is a stab in the back to our country and our people," Mr Putin said in a televised address.