The US warns of catastrophic consequences if Russia uses nuclear weapons.

 White House National Security Adviser Jake Sullivan promised Sunday that there would be “catastrophic” consequences if Russia used a nuclear weapon in Ukraine and said the US will enact further economic sanctions against Russia if the Kremlin completes its “sham” referenda, reported CNN. On further consequences against Russia for the referenda in occupied Ukrainian territories, Sullivan pointed to the G7 leaders’ statement from Friday and said there will be more announcements from the US in the days ahead. Sullivan added that the Russians “understand where we are, we are planning for every contingency, and we will do what is necessary to deter Russia from taking this step. And if they do, we will respond decisively.”