Yoshiko Herrera, a professor of political science at the University of Wisconsin-Madison and an expert on Russia and eastern Europe, joins Live at Four to talk about the Russian invasion of Ukraine.

WATCH ABOVE: Yoshiko Herrera, a professor of political science at the University of Wisconsin-Madison and an expert on Russia and eastern Europe, joins Live at Four to talk about the Russian invasion of Ukraine.

WATCH BELOW: Jon Pevehouse, the chair of UW-Madison’s political science department, joins Live at Four to explain what’s next following Russia’s invasion of Ukraine.

Jon Pevehouse, the chair of UW-Madison's political science department, joins Live at Four to explain what's next following Russia's invasion of Ukraine.