By Louis Charbonneau UNITED NATIONS (Reuters) - Britain has written to U.N. Secretary-General Ban Ki-moon about additional suspected chemical weapons attacks by Syrian government forces in March and April, British U.N. Ambassador Mark Lyall Grant said on Wednesday. "We continue to inform the Secretary-General and Mr. Sellstrom of any information as, and when, we get it," he said, referring to the Swedish head of a U.N. chemical weapons investigation team, Ake Sellstrom.

By Alissa de Carbonnel MOSCOW (Reuters) - Disputes between Russia and the West over arming warring sides in Syria on Tuesday dimmed prospects for peace talks that were also clouded by disarray among President Bashar al-Assad's political foes. As Western nations debate what action, if any, they should take on Syria, Assad's main allies - Russia, Iran and Lebanon's Shi'ite Hezbollah group - have been closing ranks behind him.

The UN's top rights body will on Wednesday debate a draft resolution condemning the Syrian regime's use of foreign fighters in the besieged town of Qusayr. A draft resolution presented on Tuesday "condemns the intervention of foreign combatants fighting on behalf of the Syrian regime in Al-Qusayr," an implicit reference to the involvement of fighters from Lebanon's militant group Hezbollah in the fierce battle for the strategic town.

Three Lebanese soldiers were killed overnight by a group of gunmen near the Syrian border, the army said on Tuesday, in the deadliest such attack since the start of the Syrian uprising. "Around 3:30am, an army position in the Wadi Hmayyed-Arsal was attacked by an armed group in a black Jeep," an army statement said. "The soldiers at the checkpoint faced off against the attackers, clashes ensued and three soldiers were killed," it added. "Searches are continuing in the area for the armed men who escaped into the neighbouring field," the statement said.