Ukrainian President Volodymyr Zelensky met his US counterpart Joe Biden at the White House on Thursday to present his wartime "victory plan", after the US announced an $8 billion surge in military aid for Kyiv's fight against Russia. FRANCE 24's Sharon Gaffney speaks to Mark Temnycky, a Ukrainian-American journalist and non-resident fellow at the Atlantic Council's Eurasia Centre. He says that Ukraine's repeated crossing of Moscow's "red lines" in the past two years shows that the nuclear threat is a bluff.