You don't want to have to go hat in hand to the Russians for RD-180 engines to launch your national security payloads (which the Russians specifically won't sell their engines to US integrators for [1] [2]), or waste $100 million more on an unnecessary Delta launch (vs Atlas). Better to ignore a minor infraction.

[1] https://www.google.com/search?q=russian+engines+national+sec...

[2] https://nationalinterest.org/blog/the-buzz/americas-national...