was an existential threat on our country. joe biden warned that this could and would trigger a response. >> we would respond if he uses it. the nature of the response would depend on the nature of the use. >> according to "the new york times," the biden administration has also assembled a national security team called the tiger team to assess various responses if russia were to expand its war beyond ukraine or use weapons of mass destruction. in a first, nato leaders agreed to provide ukraine with equipment to protect against chemical, biological, radiological and nuclear threats and discussing the possibility of providing anti-ship weapons amid concerns russia will launch amphibious assaults. the nato secretary-general and joe biden warned china, meanwhile, against coming to