Yemen President Ali Abdullah Saleh made a dramatic and sudden return to his couuntry on Friday after nearly four-months in Saudi Arabia, seeking to reinsert himself at the center of a slowly fracturing country mired in bloody clashes on the streets of its capital. His return, announced by state news agencies, appeared unlikely to immediately quell the fighting, which has left more than 70 people dead since Sunday in fierce street battles between government forces and soldiers who have sided with antigovernment protesters. Mr. Saleh did not immediately make a public address explaining the reasons for his return, and many high ranking officials said they were not given any prior warning. The Associated Press reported that a statement had been issued by Mr. Salehs office calling for a cease-fire and a new round of negotiations.