By Marwa Rashad and Christoph Steitz LONDON/FRANKFURT (Reuters) – German utilities RWE and Uniper are close to striking long-term deals to buy liquefied natural gas (LNG) from Qatar’s North Field Expansion project to help replace Russian gas, three sources familiar with the matter said. Talks between Germany and Qatar have been fraught with differences over key conditions such as the length of contracts and pricing but the industry sources, who declined to be named, said the parties were expected to reach a compromise soon. Europe’s biggest economy aims to replace all Russian energy imports by…