BEIRUT — Syria’s civil war spilled over into neighboring Lebanon once again on Sunday, with gun battles in the northern city of Tripoli between supporters and opponents of President Bashar Assad’s regime that left four dead.
The fighting between pro- and anti-Assad gunmen flared as bodies of three Lebanese — who were killed after crossing into Syria to fight in the civil war — were brought back home for burial. In addition to the four killed, 12 people were wounded in the gunfights.
Also Sunday, nine Syrian judges and prosecutors defected to the opposition. It was the latest setback for the regime, which appears increasingly embattled with rebels making gains in northern Syria and near Damascus, the capital.
The defecting judges posted a joint statement online urging others to join them and break ranks with Assad’s regime. There have been several high-level defections over the past year, including Assad’s former prime minister.
In Geneva, the United Nation’s Special Representative for Syria and the Arab League, Lakdhar Brahimi, met with Russian Deputy Foreign Minister Mikhail Bogdanov and US Deputy Secretary of State William Burns to discuss the crisis in Syria.
They said in a joint statement that the situation in Syria was ‘‘bad and getting worse,’’ but added that a political process to end the conflict was ‘‘still necessary and still possible.’’
Russia and the United States have argued bitterly over how to address the conflict, which began with peaceful protests against Assad in March 2011 and escalated into a civil war that has killed an estimated 40,000 people. Activists said another 45 were killed Sunday.
In Moscow, Russian Foreign Minister Sergey Lavrov said that Russia agreed to take part in the Geneva talks on condition there would be no demand for Assad to step down. Washington and its allies, including Turkey and Qatar, have repeatedly called on the Syrian president to step down to help stop the bloodshed.
‘‘We are not conducting any negotiations on the fate of Assad,’’ Lavrov said, adding that the Americans were wrong to see Moscow as softening its position on Syria. ‘‘All attempts to portray things differently are unscrupulous, even for diplomats of those countries which are known to try to distort the facts in their favor.’’
Addressing fears that Assad could use chemical weapons in a last-ditch effort to save his regime, Lavrov once again said the Syrian government has given assurances that it has no intention of ever using the weapons of mass destruction. He said the greatest threat is that they would fall into the hands of militants.
Russia’s foreign minister said that after he agreed to a US proposal to have his deputies and those of Secretary of State Hillary Rodham Clinton brainstorm on Syria, the Americans began to suggest that Russia was softening its position.
‘‘No such thing,’’ Lavrov said. ‘‘We have not changed our position.’’
He urged the international community to come together and ‘‘with one voice’’ to demand a cease-fire, return UN observers in bigger numbers, and begin a political dialogue. Lavrov repeated that Russia was not wedded to Assad but believed that only the Syrians have the right to choose their leaders.
In Washington, a senior State Department official said the United States remains willing to hold additional discussions in the weeks ahead, if it would help ‘‘advance the process of political transition that the people of Syria seek.’’
Qatari Prime Minister and Foreign Minister Hamad bin Jassim Al Thani urged Assad to step down. With the rebels at the president’s doorstep in Damascus, he said, Assad knows the regime will fall. ‘‘But how much killing and destruction does he want before this inevitable outcome?’’ Hamad said after an Arab League meeting in the Qatari capital, Doha.