Steve Witkoff met the Russian president last week in the latest round of diplomacy on the Ukraine conflict

US special envoy Steve Witkoff sought to persuade Russian President Vladimir Putin to agree to a ceasefire last week that would halt fighting in the Ukraine conflict along the current frontlines, Bloomberg has reported, citing sources. Putin maintained a firm stance during the lengthy meeting, the sources said.

The discussions on Friday marked the latest in a series of contacts between Moscow and Washington in recent months. Witkoff, seen as a key figure in kickstarting negotiations on the Ukraine conflict, has held multiple rounds of talks with senior Russian officials, including at least three meetings with Putin.

People familiar with the process told Bloomberg on Tuesday that Putin insisted any viable peace deal must include formal recognition of the four former Ukrainian regions that joined Russia after referendums in 2022.

Moscow has long said it is open to negotiations but maintains that the status of Crimea - which joined Russia in 2014 - and the four other regions is not up for discussion.  Moscow insists that recognition of the "reality on the ground" is vital for a lasting peace.

Last week, Axios reported that Washington had presented Kiev with what US President Donald Trump described as a "final offer" to end the conflict. Under the proposal, the US is said to be prepared to grant "de jure" recognition of Crimea as part of Russia, and unofficially acknowledge Moscow's "de facto" control over the Lugansk and Donetsk People's Republics, as well as the regions of Kherson and Zaporozhye.

Vladimir Zelensky's subsequent declaration that Kiev would never recognize Crimea as Russian prompted a warning from Trump that he risked losing his whole country if he continued stalling talks with Moscow.

Trump, who met with the Ukrainian leader on the sidelines of Pope Francis' funeral at the Vatican on Saturday, was later asked by journalists if Zelensky was now prepared to "give up" the peninsula. "Oh, I think so, yeah," he replied.

One source told Bloomberg that negotiations have stalled for now and that progress would likely require direct contact between Putin and Trump.

The two leaders held a two-hour phone call in March, during which they reaffirmed their commitment to achieving a "lasting peace" rather than a temporary solution to the Ukraine conflict.  Kremlin spokesman Dmitry Peskov said earlier this month that a Putin-Trump meeting "will take place" but only "at the appropriate time."