What's triggered tension between Ukraine and Russia?

Source: Al Jazeera English

Ukraine is accusing Russia of mobilising tens of thousands of soldiers near their shared border. The movement of Russia's 41st army units has raised fears a military offensive might be on the way. It's the second time this year Moscow has amassed combat ready forces in the region. Ukrainian President Volodymyr Zelenskyy said Russia was planning a coup to overthrow his government. Moscow rejected those allegations and blamed Kiev and the U.S. for the escalating tensions. NATO has warned Moscow that any attempt to invade Ukraine would have serious consequences. So, can this tension be contained?

Presenter: Imran Khan

Guests Olexiy Haran, Professor at the Kyiv-Mohyla Academy and the Director of Research at Democratic Initiatives Foundation. John Herbst, Senior Director of the Atlantic Council’s Eurasia Center also a former U.S. ambassador to Ukraine. Pavel Felgenhauer, Defence and Military Analyst and a Columnist for Novaya Gazeta.