So far no other prominent Western brand has reported extra scrutiny from the Russian authorities, but some are worried.
Bank of America agreed to pay $16.65 billion to end investigations into mortgage securities that it sold in the run-up to the financial crisis.
Shake Shack's potential offering could come as soon as this year, according to sources.
The dollar is strong and things could heat up even further for foreign exchange as global central bankers convene in Jackson Hole.
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