US officials say President Biden has given the green light for Ukraine to use long range missiles supplied by Washington to strike deep inside Russia. Washington had previously refused to allow such strikes with US-made ATACMS missiles because it feared they would escalate the war.

Fox News chief national security correspondent Jennifer Griffin reports on how new NATO countries are responding to Ukraine using long-range missiles into Russia on ‘Your World.’

KYIV (Reuters) -Two children were among 11 people killed when a Russian missile hit a residential building in Ukraine's northeastern city of Sumy, Ukrainian officials said, while another missile strike left the region's administrative centre without power.

What really counts, though, is what Vladimir Putin calls it and how the Kremlin leader responds. So far he’s stayed silent. But on Monday President Putin’s spokesman Dmitry Peskov told journalists that “if such a decision has been taken it means a whole new spiral of tension and a whole new situation with regard to US involvement in this conflict".

KYIV (Reuters) -Two children were among 10 people killed when a Russian missile hit a residential building in Ukraine's northeastern city of Sumy, Ukrainian officials said, while another missile strike left the region's administrative centre without power.

Ukraine launched American-made ATACMS missiles at Russia shortly before President Vladimir Putin lowered his country’s threshold for authorizing a nuclear strike, Moscow said Tuesday. The Russian Defense Ministry said its forces shot down five out of six Army Tactical Missile System projectiles,

President Biden’s decision to allow Ukraine to strike inside Russia with long-range missiles supplied by the US has sparked a furious response in Russia. "Departing US president Joe Biden… has taken one of the most provocative,

Russian President Vladimir Putin signed a revised nuclear doctrine on Tuesday to effectively lower his country's threshold for using nuclear weapons. Why it matters: The new doctrine suggests Russia could use nuclear weapons to respond to attacks by Ukraine carried out with American support.

Russian ruler Vladimir Putin issued a decree on 19 November approving Russia's updated nuclear doctrine shortly after the White House allowed Ukraine to use US-supplied weapons to strike deep into Russia.