US envoy Amos Hochstein said there was a "real opportunity" to end the conflict between Hezbollah and Israel as he visited Lebanon to discuss a ceasefire agreement.

Hochstein made the comments in Beirut on Tuesday after what he described as "very constructive talks" with Nabih Berri, the Lebanese parliament speaker who has been backed by Hezbollah to negotiate a deal.

"This is a decision-making moment. I am here in Beirut to facilitate this decision, but ultimately it is up to the parties to decide what to do with this conflict. It is now in our hands," he said, according to CNN.

The Biden administration is making a last-ditch effort to broker a truce as fighting between Hezbollah and the Israeli military escalates.

Israeli Prime Minister Benjamin Netanyahu vowed on Monday to continue "systematically operating" against Hezbollah even if a ceasefire agreement is reached.

“This is unworkable for Lebanon. They see it as a violation of the country’s sovereignty,” Al Jazeera’s Zeina Khodr reported from the Lebanese capital.

“Since the window is now open, I hope the coming days will bring about a decisive decision,” Hochstein said, but he would not answer reporters’ questions about the talks so as not to “negotiate this publicly.”

"I am committed to doing my utmost to work with the governments of Lebanon and Israel to bring this all to an end," he added.

US State Department spokesman Matthew Miller said Monday that Washington had shared the proposals with Lebanon and Israel, and both sides had responded to the plan. Miller said the United States was pushing for “full implementation” of UN Security Council Resolution 1701, which was adopted following the last war between Israel and Hezbollah in 2006. The resolution calls for Hezbollah to withdraw north of the Litani River — about 30 kilometers (18.6 miles) from the border demarcation line between Lebanon and Israel — and for Israeli forces to withdraw from Lebanese territory and deploy the Lebanese army in the south of the country alongside UN peacekeepers.

Reuters quoted an aide to Berri as saying on Monday that the Lebanese government and Hezbollah had agreed to the US proposal, which was submitted in writing last week.

During a visit to Beirut in October, Hochstein said commitments to the UN resolution were insufficient because it had failed to be implemented since it was adopted 18 years ago. He called instead for a new enforcement mechanism.