Multilateral vs bilateral diplomacy

In term of Diplomacy, is multilateral engagement through international organisations increasingly displacing bilateral one?
Introduction
Governments need to develop international relations in different fields like security, and trade as well as to decide the option of engaging in a bilateral or multilateral basis with other countries through diplomacy.
Bilateralism and multilateralism have supporters and detractors; however the multilateral approach has increased since the end of the Second World War and thanks to the globalisation that affects all the countries around the world. In this way, the international intergovernmental organizations (IGOs) have become important actors in global governance, cooperating in problem-solving agreements and providing activities to face global problems. IGOs can also be independent actors.
Bilateralism is considered the reflection of the distribution of powers between the parties, where the dominant country generally takes advantage, while multilateralism is viewed as relations that follow a pattern of principles.
This paper will argue why countries prefer multilateral engagement through international organisations rather than bilateral one with other states. The first part of the essay will focus on the need of states to engage with others. The second part will give a broader definition of bilateralism and multilateralism, the main strengths and weaknesses of each approach. The third part will cover the different role of multilateral organisations in diplomacy. Finally, the fourth part will explain the advantages of the multilateralism that place it as the preferred engagement among countries. Some examples and case studies will be used to remark this tendency. The essay however will finish with some challenges that the multilateralism approach face in the near future.
Why countries need to engage with others
As the whole society, countries cannot be isolated from the world, this means that they need to develop a foreign policy