Russia sent warplanes over Belarus airspace as outgoing German Chancellor Angela Merkel urged Russian President Vladimir Putin to “exert his influence” on Belarusian president Alexander Lukashenko to stop an escalating migrant crisis at the country’s border with Poland. CNN’s John Vause discusses with Franak Viačorka, Senior Advisor to Belarusian opposition leader Sviatlana Tsikhanouskaya.