UPDATE 3-Russian sanctions ripple through corporate boardrooms
* German companies say orders falling, business uncertain
* Danish authorities brief 130 Danish companies on Russian situation
* Visa and MasterCard halt services to clients of 2 Russian banks
* Banks very cautious after getting into sanctions trouble in the past (Adds Bombardier's doubts over deal with Russia's Rostec)
By Eric Matzen and Michelle Martin
COPENHAGEN/FRANKFURT, March 21 (Reuters) - A deepening economic standoff between Russia and the West over the future of Ukraine has rippled through trading floors and boardrooms, with exporters scrambling to protect revenues and some global financial firms halting services.
U.S. President Barack Obama's threat to target major sections of the Russian economy should President Vladimir Putin follow up his annexation of Crimea with further incursions in Ukraine has caused alarm in Europe.
Denmark's foreign ministry held a special briefing for about 130 companies, including drugs firm Novo Nordisk and brewer Carlsberg on Friday after being inundated with inquiries about the business implications of the crisis.
In an email to Reuters, Carlsberg's chief executive said he was monitoring the situation closely and would act if sanctions had a direct impact on his drinks group's business. The company produces and sells local beers in both Ukraine and Russia. Continued...