Today in the Central African Republic, government and community leaders are struggling to help the country find the path of peace.

On Monday in Kigali, I joined the people of Rwanda in commemorating the 20th anniversary of the genocide, the reverberations of which are still being felt across an arc of uncertainty in Africa’s Great Lakes region – and in the collective conscience of the international community.

Each situation has its own dynamics. So does the Syrian conflict, which each day claims new victims. But each has posed a complex, life-and-death challenge: What can the international community do when innocent populations are being slaughtered in large numbers and the government is unable or unwilling to protect its people – or is among the very agents of the violence? And what can we do to prevent these atrocities from occurring in the first place?

The genocides in Rwanda and Srebrenica were emblematic failures of the international community. The scale of the brutality in Rwanda still shocks: an average of 10,000 deaths per day, day after day, for three months, with hateful radio broadcasts inflaming and inciting Rwandans to kill Rwandans.

The international community has since made important strides in acting on the lessons of these awful events. We are now united against impunity, epitomized by the establishment of the International Criminal Court. International and UN-assisted tribunals, including the International Criminal Tribunal for Rwanda, are pursuing accountability and having a discernible deterrent effect on would-be violators of basic international norms. In a landmark judgment, a former head of state has been convicted of war crimes.

The international community has endorsed the “responsibility to protect”; states can no longer claim that atrocity crimes are a domestic matter beyond the realm of international concern. Growing numbers of governments and regional organizations are creating mechanisms dedicated to genocide prevention. The United Nations and its partners are more frequently deploying human rights monitors to trouble spots – “eyes and ears” that show governments and non-state actors alike the world is watching. And since such crimes take planning, we are targeting the key risk factors, from the lack of institutions to grievances left unaddressed.

We are also acting more robustly to protect civilians, including from rampant sexual violence. Assertive peacekeeping approaches have defeated one of the most brutal militias in the eastern Democratic Republic of the Congo. The United Nations opened the gates of its peacekeeping installations in South Sudan to shelter tens of thousands of people from deadly threats. Twenty years ago, such steps would have been unthinkable. Today, this is deliberate policy, an example of our new “Rights Up Front” initiative in action – a lesson of Rwanda made real. These situations remain fragile, but the thrust is clear: more protection, not less.

However, this work has faced regular setbacks. The end of the civil war in Sri Lanka in 2009 led to tens of thousands of deaths and a systemic failure by the United Nations to speak up and act. For more than three years, the international community has remained divided over the response to the situation in Syria, providing only a fraction of the necessary humanitarian funding while fueling the fire with arms to both sides in the mistaken belief in a military solution.

The world needs to overcome these moral blind spots. Member states may have rival definitions of national interest, or be unwilling to take on new financial or military commitments. They may be daunted by complexity and risk, or concerned that discussions about an imminent crisis in other countries might one day focus on their own situations. But the results of this indifference and indecisiveness are clear: The bloodshed of innocents, shattered societies, and leaders left to utter the words “never again,” again and again – in itself a sign of continuing failure.

Over the past decade, the Central African Republic has struggled for global awareness of its plight, and over the past year has suffered the collapse of the state, a descent into lawlessness, and gruesome mass killing that has instilled widespread terror and sparked an exodus. People are exploiting religious identity in the fight for political objectives, threatening a longstanding tradition of peaceful coexistence between Muslims and Christians.

I appeal to the international community to provide the military support urgently needed to save lives, get police back on the streets, and enable people to return to their communities. The African Union and France have deployed troops, but efforts by the European Union to launch a force have so far come to naught. There is an equally pressing need to start a political process in which reconciliation figures prominently. Any further spread of violence may engulf the wider region.

When the collapse of a country is this profound, the challenge may seem insurmountable. Yet history proves otherwise. The sustained support of the international community has helped Sierra Leone and Timor-Leste make dramatic transformations. Rwanda has registered notable gains in development, and other countries have healed after unspeakable violence. The Central African Republic can walk the same path. I will continue to stand with the government in charting a course that can build the stable and prosperous country its resources and traditions can make possible.

In Rwanda, I visited the genocide memorial and paid tribute to the victims – as I have for other tragedies that have challenged the world, from Auschwitz and Cambodia decades ago, to others in our time. The international community cannot claim to care about atrocity crimes and then shrink from the commitment of resources and will required to actually prevent them.

Global leaders should do more to prevent the preventable, and to counter the cruelty taking place before our eyes. People everywhere should place themselves in the shoes of the vulnerable, from Syria to the Central African Republic, and ask themselves what more they can do to build a world of human rights and dignity for all. Let us show people facing dire threats that they are not alone or abandoned – and that the lifeline they need is on its way.

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Ban Ki-moon is Secretary-General of the United Nations. This article was first published in The Independent.

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