SEOUL, April 13 (Reuters) - Round-up of South Korean financial markets:
** South Korean shares fell on Monday, after the U.S. and Iran failed to reach a deal to end the war over the weekend. The won weakened, while the benchmark bond yield rose.
** The benchmark KOSPI .KS11 was down 62.26 points, or 1.06%, at 5,796.61 as of 0245 GMT, after falling more than 2% earlier in the session.
** The U.S. military said it will begin a blockade of all maritime traffic entering and exiting Iranian ports and coastal areas on Monday after weekend talks failed to reach a deal to end the war with Iran, jeopardizing a fragile two-week ceasefire.
** "The blockade of the Strait of Hormuz by the U.S. raises the possibility of increased market volatility and global supply chain disruptions," said Seo Sang-young, an analyst at Mirae Asset Securities.
** Among index heavyweights, chipmaker Samsung Electronics 005930.KS fell 2.18%, while peer SK Hynix 000660.KS gained 0.19%. Battery maker LG Energy Solution 373220.KS slid 2.06%.
** Hyundai Motor 005380.KS and sister automaker Kia Corp 000270.KS were down 2.25% and 1.48%, respectively. Steelmaker POSCO Holdings 005490.KS shed 2.71%, while drugmaker Samsung BioLogics 207940.KS fell 1.27%.
** Of the total 908 traded issues, 332 shares advanced, while 538 declined.
** Foreigners were net sellers of shares worth 630.8 billion won ($423.41 million).
** The won was quoted at 1,489.8 per dollar on the onshore settlement platform KRW=KFTC, 0.42% lower than its previous close at 1,483.5.
** In money and debt markets, June futures on three-year treasury bonds KTBc1 lost 0.14 point to 104.15.
** The most liquid three-year Korean treasury bond yield KR3YT=RR rose by 5.2 basis points to 3.408%, while the benchmark 10-year yield KR10YT=RR rose by 5.4 basis points to 3.741%.
($1 = 1,489.8000 won)
(Reporting by Jihoon Lee; Editing by Eileen Soreng)