* US and European officials discussing plans for Ukrainian government in exile
* US talking with allies re: banning imports of Russian oil, says US Sec. of State
* West resists calls from Ukraine for establishing a no-fly zone
* US walks fine line supplying arms to Ukraine and avoiding direct conflict
* Ukraine war will shock food supply and cost, warns exec at fertilizer firm
* Average US gasoline price tops $4 a gallon, highest since 2008
* Forecasters increasingly cautious on US economic outlook
* US payrolls rebounded in February, rising well above the consensus forecast: