(Washington, D.C.) -- President Biden is committed to keeping U.S. troops out of the conflict with Russia in Ukraine. That's according to White House press secretary Jen Psaki. She said a no-fly zone would need troops to implement it. She said the move would require deploying American troops which would mean the potential for a direct conflict and potentially a war with Russia. This comes as Ukraine President Volodymyr Zelensky called for a "complete closure of the sky."