He's not talking about Russian banks listening to the SEC, he's talking about Western banks lending money to the Russians, and basically it's the German and French banks that are on the hook in Russia.
Now for all the issues with financial services and the SEC, these banks won't simply ignore it. They might try to get round whatever restrictions are imposed, but that's a much riskier business these days than it was just 5 or 6 years ago. Western governments are paying much closer attention to what their banks are up to than they did in the past, for obvious reasons.
Sanctions are incoming from the EU:
EU sanctions 'long-list' of ~130 included Gazprom/Rosneft CEOs. Actual travel ban/asset freezes will be 20 to 40 people.
Bruno Waterfield (BrunoBrussels) on Twitter
The "short list" names will be focused on those with an interest in Crimea. The full list will be discussed later in the week once they've seen the Russian reaction.