United Kingdom Prime Minister Keir Starmer unveiled a 4-step plan for Ukraine.

“We are at a crossroads in history,” Starmer said.

His remarks come just days after Ukrainian President Volodymyr Zelensky met with President Trump to discuss a deal to end the three-year war with Russia, but the meeting ended with a shouting match and Zelensky departing the White House early.

World leaders have rallied behind Zelensky and scrambled to come up with their own negotiations.

“Any deal must be backed by strength. Every nation must contribute to that in the best way that it can, bringing different capabilities and support to the table, but all taking responsibility to act, all stepping up their own share of the burden,” Starmer said.

Starmer and other leaders have been meeting in the U.K., working to secure a deal, now without the U.S. Leaders agreed to keep aid flowing into Ukraine for an extended period of time so it would be prepared if Russia tried to strike again after the ceasefire deal was secured, the first of the four-part plan, BBC reported.

He also announced a deal that would finance 5,000 air defense missiles, which were to be made in Belfast and promote economic growth.  

The deal also confirms that lasting peace in Ukraine must mean the country remains sovereign and secure, and it must be at the negotiating table.

If Ukraine and Russia are able to reach a deal, European leaders also confirmed they will aim to deter future invasion. Those European leaders say they will form a “coalition of the willing” to defend Ukraine.