Crises can dramatically affect international relations by altering alliances, reshaping foreign policy objectives, and influencing global stability. Events like wars, economic downturns, or humanitarian disasters require nations to respond rapidly, often leading to changes in diplomatic relations or shifts in global power dynamics. Additionally, crises can trigger cooperation among nations to address mutual threats or challenges, fostering new partnerships. Conversely, they may also exacerbate existing tensions and lead to isolationism. Ultimately, the nature of the crisis determines its impact on international diplomacy and cooperation.