THE HAGUE, Feb 20 (Reuters) - Russia has in recent months tried to gain intelligence to sabotage critical infrastructure in the Dutch part of the North Sea, Dutch military intelligence agency MIVD said on Monday. A Russian ship has been detected at an offshore wind farm in the North Sea as it tried to map out energy infrastructure, MIVD head General Jan Swillens said at a news conference. See here for a complete list of exchanges and delays