Ukrainian officials are set to meet with U.S. counterparts in Switzerland on Sunday to discuss a 28-point plan proposed by Washington for ending the nearly four-year war with Russia.
The plan requires Ukraine to cede territory, reduce its armed forces, and commit to never joining NATO.
President Donald Trump set a Thursday deadline for Kyiv to accept the proposal.
Ukraine's delegation, led by Andriy Yermak, includes top security officials such as Rustem Umerov.
President Volodymyr Zelenskyy has approved instructions for the talks, emphasizing the need to protect national interests and prevent future Russian invasions.
The decree mentions inclusion of Russian representatives, though Moscow has not confirmed participation.
Allies from Germany, France, the UK, the EU, Canada, and Japan have stated that the U.S. plan serves as a basis for discussions but requires additional work.
They oppose changing borders by force and express concern over limits on Ukraine's military that could leave it vulnerable.
German Chancellor Friedrich Merz stressed that any resolution must have Ukraine's unconditional consent and not be imposed by major powers.
A joint statement from Western leaders noted that elements involving the EU or NATO need member state approval.
Russia's Deputy Foreign Minister Sergey Ryabkov indicated openness to further dialogue, including potential meetings between Trump and President Vladimir Putin.
Putin has declined summits involving Zelenskyy, citing Russia's battlefield advantages.
Meanwhile, Russian forces report gains in eastern Ukraine, including the capture of Zvanivka in Donetsk and areas in Zaporizhia such as Novoe Zaporozhye.
The Russian Defense Ministry claimed control over a major defense node and released footage of attacks using glide bombs and drones.
Intense fighting persists in the Pokrovsk area, with Ukrainian forces facing redeployed Russian troops.
Regional authorities reported one civilian death and 13 injuries from Russian air strikes in Donetsk.
Ukraine's air force downed 89 of 104 Russian drones and one ballistic missile launched overnight.
Ukrainian drones targeted a substation in Crimea, while Russia claimed to intercept six Ukrainian drones over the peninsula.