Professor Robert Patman: Director of International Studies at Otago University explains situation between Russia and Ukraine

We've been discussing the Russian invasion of Ukraine overnight. 
Ukrainian forces are battling Russian invaders on three sides after Moscow mounted an assault by land, sea and air. 
Thousands of Ukrainians are fleeing to neighbouring countries, including Poland, Hungary and Romania. 
New Zealand has joined other Western leaders in condemning the invasion and imposing sanctions against Russia. 
For an explainer as to why this is happening, Director of International Studies at Otago University, Professor Robert Patman joined Kerre McIvor. 
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