<Tr> <Td> Eritrean - Ethiopian War </Td> <Td> United Nations Mission in Ethiopia and Eritrea </Td> <Td> 70 </Td> <Td> 15 </Td> <Td> 0 </Td> </Tr> <Tr> <Td> Burundi Civil War </Td> <Td> United Nations Operation in Burundi </Td> <Td> 80 </Td> <Td> 5 </Td> <Td> 0 </Td> </Tr> <Tr> <Td> Rwanda Civil War </Td> <Td> United Nations Observer Mission Uganda - Rwanda </Td> <Td> 65 </Td> <Td> 15 </Td> <Td> 0 </Td> </Tr> <Tr> <Td> Second Liberian Civil War </Td> <Td> United Nations Mission in Liberia </Td> <Td> 30 </Td> <Td> </Td> <Td> </Td> </Tr>

Under what conditions can un peacekeepers enter a country