What actions did the USA take in 2003 to prevent other countries from coming to Iraq's aid?

Question

When the US invaded and occupied Iraq in 2003, I believe that neighboring countries and one of their major arms suppliers- Russia- stood down, at best. What actions did the USA take to dissuade any actions on the parts of those countries, either to assist Iraq (overtly or covertly) or to opportunistically make other moves deemed undesirable to American interests?

Answer 1

In regards to your question, the United States, both diplomatically and militarily, took many actions to prevent neighboring countries (primarily Middle Eastern countries) to support Iraq in 2003. to simplify it, I've condensed a list for you:

1. The United States and President Bush's administration worked hard to gain the diplomatic support from other countries (especially those in Western Europe like Great Britain and other members of the EU, as well as Turkey and other countries in the region).
2. Another way the United States dissuaded outside support was through military buildup. By conducting a massive military buildup in the region, this show of force would deter the presence and/or support for Iraq, as this would be a direct conflict with the United States and its allies.
3. The United States also issued several warning to neighboring countries not to interfere with the invasion of Iraq; for example, directed towards countries like Syria and Iran.
4. Aligned with the military buildup in the region, the United States and the Bush administration maintained a public rhetoric of warning other countries to not get involved. The U.S. made it abundantly clear it was willing to take military action against any country that would interfere with the invasion of Iraq.