President Donald Trump confirmed that he will hold a crucial phone call with Russia's President Vladimir Putin tomorrow.  

'I'll be speaking to [President Putin] on Tuesday. A lot of work's been done over the weekend,' Trump revealed.

'We want to see if we can bring that war to an end,' Trump told reporters on Air Force One as he travelled back to Washington D.C. from Mar-a-Lago in Florida on Sunday. 

'Maybe we can, maybe we can't, but I think we have a very good chance,' he added. 

Trump said he plans to discuss land and power plants with the Russian leader in a discussion about potential concessions.

'I think we have a lot of it already discussed very much by both sides, Ukraine and Russia,' Trump continued. 'We are already talking about that... dividing up certain assets.'

But as Trump strikes an optimistic tone, Russia's deputy chair of its Security Council, Dmitry Medvedev, slammed French President Emmanuel Macron and British Prime Minister Keir Starmer for proposing to station peacekeepers from NATO countries in Ukraine. 

He wrote on X that 'means war with NATO' and suggested Trump was aware of the demand. 

Over the weekend, Trump made bold predictions about the ceasefire deal in Ukraine. 

The 78-year-old president sat down for a pre-taped interview with the weekly news program Full Measure and was asked about his plans should Putin not agree to a ceasefire. 

'Bad news for this world because so many people are dying,' Trump responded.

But the president insisted he thinks Putin will agree to the deal. 

'I think he's going to agree. I really do. I think I know him pretty well, and I think he's going to agree,' Trump told anchor Sharyl Attkisson. 

Trump would not say during his interview whether he was speaking with Putin recently, but said 'we are dealing with him'.

It comes as Trump administration special envoy Steve Witkoff held a meeting with Putin behind closed doors on Thursday as the U.S. pushes for the ceasefire deal. 

'It was positive. It was a solution-based discussion,' Witkoff told CNN's State Of The Union on Sunday on his return. 

He said he expects there will be a call between Trump and Putin 'this week'. 

Trump said in the interview that they're looking to to get Russia onboard with the ceasefire deal reached with Ukraine and said it's going 'OK'. 

He suggested they would know a little bit more on Monday. 

Attkisson noted in her interview with the president that he claimed he would have the war settled in 24 hours. 

'Well, I was being a little bit sarcastic when I said that,' Trump responded. 'What I really mean is I would like to get it settled.'

Trump predicted that he thinks he will be 'successful.'

Putin said on Thursday that he supports a ceasefire but also outlined details that needed to be negotiated before a deal could be made. 

Witkoff declined to outline exactly what Russia was demanding on Sunday but said that the two sides are a 'lot closer' than they had been. 

'We've narrowed the differences between them,' Witkoff said.  He said that he's been in discussions with Trump over the weekend on how to narrow the differences 'even further'.

He would not say whether the US would recognize Ukrainian territory annexed by Russia as Russian territory in the future.  

Witkoff noted on Sunday that the US also continues to have conversations with the Ukrainians.

He signaled that he believes where will be a deal in the coming weeks after he met with Putin despite it being unclear exactly what Russia is willing to agree to.

'President Trump wants to see an end to this. I think President Putin wants to see an end to this. I think President Zelensky wants to see an end to this,' Witkoff said. 

He said the details need to be worked out at the table, but he believes all sides are 'committed to doing that.' 

Secretary of State Marco Rubio was asked last week how long Putin had to agree to a deal, but he appeared more cautious in his assessment. 

'I think the question is: Are we actually moving towards a ceasefire or is this a delay tactic?' he told reporters. 

'I'm not going to answer that because I can't characterize that for you right now,' Rubio added. He said there they were not there yet, but he insisted that they would get there.