 Welcome to the Voice of America's Newswords. On February 24, Russia launched a full-scale invasion of its neighbor, Ukraine. Siege Ukrainian President Vladimir Zelensky has accused Russia of terror for bombing cities and striking a nuclear power plant. A siege is a military operation in which enemy forces surround a town or building and cut off supplies. The aim of a siege is surrender. The Russian President Vladimir Zelensky has accused Russia of terror for bombing cities and striking a nuclear power plant.