CEVAP:

In order to bilateral diplomacy to take place, recognition by states of each other as legally established states is a prerequisite. Once that happens according to each state’s practices, then
exchange of diplomats take place and diplomatic communication starts. However, in certain cases, states may decide either to withhold recognition of other states or not complete exchange of diplomatic representatives. Diplomacy can still occur in these cases between state representatives but in a nonformal way. An example for the former is nonrecognition of the “Republic of Cyprus” by Turkey as the legal representative of the island of Cyprus and both Turkish and Greek communities living on the Island. On the other hand, Turkey recognizes the Republic of Armenia as a state, but decided in 1991 not to establish bilateral diplomatic relations and exchange ambassadors.