The head of Russia's Belgorod region has declared a state of emergency, saying the situation was "extremely difficult" in the border area under Ukrainian bombardment. Belgorod borders Ukraine's Kharkiv region and neighbours Kursk, where Ukraine has launched a surprise offensive in the most significant cross-border attack on Russian soil since World War II. 

We speak to Nina Khrushcheva, Professor of International Affairs at the New School in New York, and great-granddaughter of Soviet leader Nikita Khrushchev.