Is Crimea the start of a new Cold War?

In "Telephone Diplomacy," declassified transcripts of telephone conversations between US Secretary of State Henry Kissinger and Soviet Ambassador to the US Anatoly Dobrynin tell the tale of "detente." This was a time of relaxed tensions between the superpowers in the 1970s. I argue that through secret "back channel negotiations (BCN)," Kissinger and Dobrynin gradually forged a relationship which enabled them to make progress despite strongly conflicting American and Soviet ideologies. (I make a similar case in the conclusion about Reagan and Gorbachev in the late 1980s.) Could back channel negotiations help resolve the current US-Russian dispute or is this a case where the gulf is too wide?