By Christoph Steitz and Tom Käckenhoff FRANKFURT (Reuters) – German utility Uniper is assessing whether the suspension of Gazprom’s Nord Stream 2 will trigger impairments on its 1 billion euro ($1.1 billion) exposure to the gas pipeline, the company said on Wednesday, sending its shares to a 7-month low. Uniper, majority-owned by Finland’s Fortum, said the worsening of the Ukraine crisis meant that Nord Stream 2 “could delay further or be affected otherwise”, adding that it was constantly monitoring the situation. Berlin on Tuesday halted Nord Stream 2, which would double Russian gas flows to …