I have't been paying close attention, but maybe you know this. Didn't Russia actually ban export of engines for military launches over Crimea before congress?
http://www.theguardian.com/science/2014/may/15/us-space-mili... http://www.latimes.com/business/la-fi-russian-rocket-ban-201...
All rocket, no engines.
After Russia annexed Crimea, Congress banned the Pentagon from using Russian rocket engines. Russia responded by counter-banning the Pentagon from using its engines [3]. This made things complicated for ULA.
[1] https://en.wikipedia.org/wiki/RD-180
[2] http://www.ulalaunch.com/faqs-rd-180.aspx
[3] http://www.bloomberg.com/news/articles/2014-05-13/russia-ban...
So if you're a rocket company and don't make your own engines you're not really a rocket company, you're just talk.
The reason they had to drop out is because they're a space launch company without any goddamned engines. The chatter about the bid process is just the typical jawing members of the defense cartel engage in when they deign to speak of competitors. Sometimes they're even successful in reopening the bid process. [1]
[1]: https://en.wikipedia.org/wiki/KC-X