Ukraine war latest updates: Zelenskyy in Davos to plead Ukraine's case before global elite; Russian city declares state of emergency

This is CNBC's live blog tracking developments on the war in Ukraine. See below for the latest updates. 

Ukrainian President Volodymyr Zelenskyy will address delegates at the World Economic Forum in Davos on Tuesday.

The address offers Zelenskyy an opportunity to plead Ukraine's case for continuing military and humanitarian aid in front of dozens of heads of state and government, as well as business leaders. The forum comes at a time when ongoing support for Kyiv looks shaky, given increasing war fatigue and forthcoming elections in the European Parliament and U.S. that could change the dial on military aid.

The address will take place at 14:15-15:00 CET, or 13:15 London time.

In other news, the Russian city of Voronezh introduced a state of emergency Tuesday morning after an alleged Ukrainian drone attack injured a 13-year-old girl and damaged apartment buildings.

The city's mayor Vadim Kstenin said on Telegram that a "night raid" damaged four residential buildings, breaking dozens of windows. He said a state of emergency had been introduced in the city to allow an assessment of the damage and repairs to be made.

Ukrainian Foreign Minister Dmytro Kuleba, in an interview made public on Monday, said there had been times when he had felt the urge to "punch in the face" his Russian opposite number Sergei Lavrov in talks during the early stage of Moscow's invasion.

Kuleba's brief remarks were part of an hour-long informal interview with a Ukrainian video blogger focusing on topics ranging from cooking to hobbies and Ukrainian soccer.

When asked, as part of a series of rapid-fire questions, about his most difficult set of negotiations, Kuleba said: "The most difficult talks are those in which you feel simply that you want to go and