The busiest diplomatic week of the year is underway as world leaders gather this week in New York to address the 77th session of the United Nations General Assembly.

The war in Ukraine, climate change and nuclear disarmament are likely to dominate speeches and discussions during the annual gathering at the UN headquarters.

With Russian President Vladimir Putin announcing a partial mobilization and upping the ante in the war with Ukraine, how will the rest of the world respond? Will this bring the direct conflict between the West and Russia one step closer? What is likeliest outcome in Ukraine? 

Prime Time's Bharati Jagdish speaks with Dr Samir Puri, author of a new book, 'Russia's Road to War With Ukraine' for a deep dive.