U.S. President Donald Trump is expected to speak with his Russian counterpart Vladimir Putin this week on ways to end the three-year war in Ukraine, U.S. envoy Steve Witkoff told CNN on Sunday after returning from what he described as a “positive” meeting with Putin in Moscow, Reuters reported.

“I expect that there will be a call with both presidents this week, and we’re also continuing to engage and have conversation with the Ukrainians,” said Witkoff, who met with Putin on Thursday night, adding that he thought the talk between Trump and Putin would be “really good and positive.”

Trump is trying to win Putin’s support for a 30-day ceasefire proposal that Ukraine accepted last week, as both sides continued trading heavy aerial strikes through the weekend and Russia moved closer to ejecting Ukrainian forces from their months-old foothold in the western Russian region of Kursk.

Trump said in a social media post on Friday that there was “a very good chance that this horrible, bloody war can finally come to an end.” He also said he had “strongly requested” that Putin not kill the thousands of Ukrainian troops that Russia is pushing out of Kursk.

Putin said he would honor Trump’s request to spare the lives of the Ukrainian troops if they surrendered. The Kremlin also said on Friday that Putin had sent Trump a message about his ceasefire plan via Witkoff, expressing “cautious optimism” that a deal could be reached to end the conflict.

In separate appearances on Sunday shows, Witkoff, Secretary of State Marco Rubio, and Trump’s national security adviser, Mike Waltz, emphasized that there are still challenges to be worked out before Russia agrees to a ceasefire, much less a final peaceful resolution to the war, read the report.

Asked on ABC whether the U.S. would accept a peace deal in which Russia was allowed to keep stretches of eastern Ukraine that it has seized, Waltz replied, “Are we going to drive every Russian off of every inch of Ukrainian soil?” He added that the negotiations had to be grounded in “reality.”

Rubio told CBS a final peace deal would “involve a lot of hard work, concessions from both Russia and Ukraine,” and that it would be difficult to even begin those negotiations “as long as they’re shooting at each other.”

Trump has warned that unless a ceasefire is reached, the conflict between Moscow and Kyiv has the potential to spiral into World War Three.

His administration took steps last week to induce further cooperation on a ceasefire. On Saturday, Trump said that General Keith Kellogg’s role had been narrowed from special envoy for Ukraine and Russia to only Ukraine, after Russian officials sought to exclude him from peace talks.

A license allowing U.S. energy transactions with Russian financial institutions expired last week, according to the Trump administration, raising pressure on Putin to come to a peace agreement over Ukraine, Reuters reported.

The U.S. Treasury Department is looking at possible sanctions on Russian oil majors and oilfield service companies, a source familiar with the matter said, deepening steps already taken by Biden.

U.S. President Donald Trump said on Thursday he still has a good relationship with North Korean leader Kim Jong Un, with whom he held several summits during his first term, and referred to North Korea once again as a “nuclear power.”

Asked by reporters during an Oval Office meeting with NATO Secretary-General Mark Rutte whether he had plans to reestablish relations with Kim, Trump said: “I would … I have a great relationship with Kim Jong Un, and we’ll see what happens, but certainly he’s a nuclear power,” Reuters reported.

On January 20, when he was inaugurated for his second term, Trump said North Korea was a “nuclear power,” raising questions about whether he would pursue arms reduction talks rather than denuclearization efforts that failed in his first term in any re-engagement with Pyongyang.

After referring to Russia and China’s nuclear arsenals, Trump said: “It would be a great achievement if we could bring down the number. We have so many weapons, and the power is so great.

“And number one, you don’t need them to that extent. And then we’d have to get others, ’cause, as you know, in a smaller way – Kim Jong Un has a lot of nuclear weapons, by the way, a lot, and others do also. You have India, you have Pakistan, you have others that have them, and we get them involved.”

Asked if Trump remarks represented any shift in policy towards North Korea’s nuclear weapons, a White House official said: “President Trump will pursue the complete denuclearization of North Korea, just as he did in his first term.”

On February 15, U.S. Secretary of State Marco Rubio and his Japanese and South Korean counterparts reaffirmed their “resolute commitment to the complete denuclearization” of North Korea in accordance with U.S. Security Council Resolutions.

Last week, Kim Jong Un’s powerful sister Kim Yo Jong criticized the Trump administration for stepping up "provocations" and said it justified North Korea increasing its nuclear deterrent. This week North Korea fired multiple ballistic missiles, its first since Trump took office.

President Masoud Pezeshkian said Iran would not negotiate with the U.S. while being threatened, telling President Donald Trump to “do whatever the hell you want”, Iranian state media reported on Tuesday.

“It is unacceptable for us that they (the U.S.) give orders and make threats. I won’t even negotiate with you. Do whatever the hell you want”, state media quoted Pezeshkian as saying.

Iran’s Supreme Leader Ayatollah Ali Khamenei said on Saturday that Tehran would not be bullied into negotiations, a day after Trump said he had sent a letter urging Iran to engage in talks on a new nuclear deal, Reuters reported.

While expressing openness to a deal with Tehran, Trump has reinstated the “maximum pressure” campaign he applied in his first term as president to isolate Iran from the global economy and drive its oil exports down towards zero.

In an interview with Fox Business, Trump said last week, “There are two ways Iran can be handled: militarily, or you make a deal” to prevent Tehran from acquiring nuclear weapons.

Iran has long denied wanting to develop a nuclear weapon. However, it is “dramatically” accelerating enrichment of uranium to up to 60% purity, close to the roughly 90% weapons-grade level, the IAEA has warned.

Iran has accelerated its nuclear work since 2019, a year after then-President Trump ditched Tehran’s 2015 nuclear pact with six world powers and reimposed sanctions that have crippled the country’s economy.