SANAA (Reuters) - A nephew of President Ali Abdullah Saleh who commands a key paramilitary unit has called for talks to end Yemen's political stand-off but threatened to "break the necks" of any faction that seeks again to remove Saleh by force. Brigadier General Yehia Mohamed Abdullah Saleh, an important power broker as head of the Central Security Forces, also said Yemen would not slide anew into the open warfare seen in May after months of street protests aimed at toppling the president. Saleh is recuperating in Saudi Arabia from wounds suffered in an assassination attempt during battles with tribal factions that leveled parts of the capital Sanaa.