Russian President Vladimir Putin launches military operation in Ukraine.

Russian President Vladimir Putin launches military operation in Ukraine.

Explosions heard in Ukrainian cities of Kyiv, Kharkiv and Odesa.

Ukrainian President Zelensky declares martial law, urges people to stay home and not panic.

U.S. President Joe Biden says, "the world will hold Russia accountable."

Ukraine's border guard agency says Russian troops also entered from neighbouring Belarus.

Prime Minister Justin Trudeau calls Russian action "unprovoked" and "a clear further violation of Ukraine's sovereignty."