But Pillar Two of the R2P principle recognizes the role of the international community in preventing mass atrocities through exerting pressure on states to comply with their international obligations and by assisting states to build capacity via, for example, a UN or regional presence or development assistance (UNSG, 2009: paras. Early warning and assessment are also an important part of the preventive strategy advocated by the Secretary-General (UNSG, 2010). This is especially important, given that ethnic cleansing is one of the four atrocity crimes.