United Nations marked its 75th anniversary yesterday, with an appeal from Secretary-General Antonio Guterres to preserve the longest period in modern history without a military confrontation between the world's most powerful nations.<br />''<br />''Addressing the UN General Assembly ceremony, marking the world body's anniversary, Mr.Guterres said, the Corona virus pandemic has laid bare the world's fragilities. Today we have a surplus of multilateral challenges and a deficit of multilateral solutions, he added.<br />''<br />''The special UNGA event to mark the 75th anniversary of the UN kick-starts the high-level General Assembly session. For the week-long General Debate, Heads of State and Government and Ministers will deliver their speeches through pre-recorded video statements, a first in the 75-year history of the world organization.<br />