According to U.S. officials, Russia isstruggling in its war against Ukraine, evidenced by its latest nuclear threats, attempts to annex parts of the neighboring country, and calls to round up hundreds of thousands of civilians as reserves.

Jake Sullivan, the White House National Security Adviser, spoke with George Stephanopoulos on ABC's "This Week" about the protests in Russia against Putin's actions.

Sullivan said that the call-up of troops, the sham referenda that they are trying to run in the occupied territories are not signs of strength. There are signs that Russia and Putin are not doing well.

The determination about how Russia proceeds and the extent to which there is resistance to what Putin has tried to do will be made by the Russians.

Sullivan told Chuck Todd on NBC's "Meet the Press" that Russia is aware of what the U.S. would do if it used a nuclear weapon. Sullivan said that this is not the first time that Putin has made a nuclear threat.

According to the senator, Putin is dangerous because he has his back against the wall, but that his threat of nuclear weapon use is a big bluff.

The use of nuclear weapons would pose a huge risk to Russian citizens. The use of nuclear weapons is going to invite a coordinated international response that will be overwhelmingly catastrophic for Russia, but the use of nuclear weapons is also posing repercussions in Russia. It is a big bluff.

The article was first published on HuffPost.

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