I don't see many businesses having huge instinctive "jingoistic political allegiances", frankly, unless perhaps if it's a SOA or military driven or the like. However, most businesses in any nation tend to work with and cooperate with national governments on various probes, particularly where they are headquartered, unless there is a huge reason not to. Congress is heavily scrutinizing Facebook and Twitter over Russian influence at the moment; reports like this (https://www.dni.gov/files/documents/ICA_2017_01.pdf) heavily critical of RT and Sputnik's role in this election are being produced by our intelligence agencies. So in this regard, Twitter's reaction is not surprising.

We'll never know is how much Twitter management agreed to drop RT/Sputnik advertising based on what they felt was right (due to whatever reason), what was right or good for the business, or whether they did this largely due to pressure from the government. The main thing we know is that Twitter's corporate reaction here is obviously different than, say, Twitter's corporate reaction to their role in the Arab Spring.

Most of the time, in general, I think RT / Sputnik do report actual events, but with a very heavy pro-Kremlin slant (so not unlike VOA in this regard). However, they dip enough of their toes into the Infowars style conspiracy theory stuff (in part because relying on native disaffected groups is part of their strategy -- http://www.europarl.europa.eu/RegData/etudes/BRIE/2015/57133... ) that I wouldn't trust an article only sourced there at all. If RT "broke" that officials covered up polluted water in 20 other major US cities, for instance, I'd look elsewhere to confirm that story.