Ukraine’s military pushed back Russian forces in a blitzkrieg across the country’s northeast this week, putting Putin under pressure from nationalists at home to regain the initiative.

		Read more: UN to allow Ukraine’s Zelensky to effectively address summit of world leaders next week 		
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			UN to allow Ukraine’s Zelensky to effectively address summit of world leaders next week 	     

Putin has warned that Moscow would respond more forcefully if its troops come under further pressure, raising concerns that it could at some point use unconventional means such as small nuclear or chemical weapons. Asked by a “60 Minutes” reporter what he would say to Putin if he were to consider using such weapons, Biden said: “Don’t do it. Don’t do it. Don’t do it. It would change the face of warfare unlike anything since World War II,” in an excerpt of the interview released by CBS on Saturday. Story continues below ad Biden said the U.S. response would be “consistent,” but declined to elaborate. Russia “would become more of a pariah in the world than ever,” Biden said. “Depending on the extent of what they do will determine what response there is.” Trending Stories

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Russian government officials have dismissed Western suggestions that Moscow would routinely use nuclear weapons in Ukraine, but it remains a concern for some in the West. 3:12 Putin warns Ukraine conflict could get more serious after telling Modi they want war to end Putin warns Ukraine conflict could get more serious after telling Modi they want war to end war In a speech announcing the invasion of Ukraine on February 24, Putin warned that if the West intervened in what he called a “special military operation,” he could use nuclear weapons in response. “No matter who tries to stand in our way or create threats to our country and our people, they should know that Russia will respond immediately and the consequences will be the likes of which you have never seen in your entire history “, he said. according to a Kremlin translation. Story continues below ad Other options for Putin could include mobilizing Russia’s reserves, numbering around 2 million men, and pressuring Europe to heavily arm Ukraine in a truce with Russia, freezing the region this winter by banning all exports energy. (Reporting by Timothy Gardner; Editing by Leslie Adler)