Russian President Vladimir Putin told his Finnish counterpart that it would be a "mistake" for Finland to join NATO, according to statement from the Kremlin.
The two leaders spoke by phone on Saturday as U.S. Senate minority leader Mitch McConnell led a delegation of Republican senators on a visit to Ukraine. Ukrainian President Volodymyr Zelenskyy said the visit was a powerful signal of bipartisan American support for Ukraine, according to the Ukrainian presidential administration.
Meanwhile, Russian troops began withdrawing from the heavily contested northeastern city of Kharkiv after weeks of shelling. The Ukrainian military said Russian troops are pulling back from Ukraine's second-largest city and are focusing on protecting supply routes, while launching attacks in the eastern Donetsk region to "deplete Ukrainian forces and destroy fortifications."
Ukraine "appears to have won the Battle of Kharkiv," the Institute for the Study of War, a Washington-based think tank, said.
The call between Finland President Sauli Niinisto and Putin about the Scandanavian country's desire to join NATO was initiated by Finland, according to a statement released by Niinisto's office.
'The conversation was direct and straightforward and it was conducted without aggravations. Avoiding tensions was considered important,' Niinisto was quoted as saying in a statement by his office.
A Kremlin statement released after the call said Putin told Niinisto that abandoning Finland's policy of neutrality would have a negative impact on Russian-Finnish relations.
Niinisto and Finnish Prime Minister Sanna Marin said Thursday that they want the country to join NATO 'without delay,' a move that would be a major policy shift for the traditionally neutral country in response to Russia's invasion of Ukraine.
'Putin stressed that the end of the traditional policy of military neutrality would be a mistake since there is no threat to Finland's security,' the Kremlin statement said.
Sweden, another traditionally neutral Scandanavian country, is also expected to ask to join NATO in the coming days.
The possible expansion of NATO will be a focus of talks Saturday, as U.S. Secretary of State Antony Blinken heads to Berlin for an informal NATO foreign ministerial meeting.
Turkish President Recep Tayyip Erdogan said Friday his country does not support Finland and Sweden joining NATO, citing their support of what Turkey considers terrorist organizations, such as Kurdish militant groups.
'We are following developments concerning Sweden and Finland, but we are not of a favorable opinion,' Erdogan told reporters in Istanbul. Any NATO enlargement requires the unanimous consent of the existing members.
U.S. officials said they were working to 'clarify Turkey's position,' while reiterating that the 'United States would support a NATO application by Finland and/or Sweden should they choose to apply.'
'We strongly support NATO's Open Door policy,' U.S. Assistant Secretary of State for European and Eurasian Affairs Karen Donfried told reporters Friday. 'I think that it's important to remember that a fundamental principle the U.S. is defending in terms of its support for Ukraine is the right of every sovereign country to decide its own future foreign and security policy arrangement.'
Both Sweden's and Finland's foreign ministers will be participating in the North Atlantic Council informal dinner Saturday in Berlin. From Germany, Blinken heads to France on Sunday, where he will attend the second ministerial meeting of the U.S.-EU Trade and Technology Council, known as the TTC.
U.S. President Joe Biden talked with Swedish Prime Minister Magdalena Andersson and Finland's Niinistö on Friday.
'President Biden underscored his support for NATO's Open Door policy and for the right of Finland and Sweden to decide their own future, foreign policy, and security arrangement,' the White House said in a readout of the call, adding the leaders 'reiterated their shared commitment to continued coordination in support of Ukraine and the Ukrainian people affected by the war.'
Impact of NATO expansion
The German Marshall Fund's Michael Kimmage told VOA that Finland's joining NATO would shake up the security order in Europe, both for NATO and for Russia.
'It's a very, very long border, and of course it brings NATO very close to - or will bring NATO if it all goes through - very close to St. Petersburg. And at the same time, it will give NATO a lot more territory right on the Russian border to defend. So those are big steps. Those are big changes,' Kimmage said.
Russia has warned against NATO expansion and said Finland's and Sweden's joining would bring 'serious military and political consequences.'
'The expansion of NATO and the approach of the alliance to our borders does not make the world and our continent more stable and secure,' Kremlin spokesman Dmitry Peskov told reporters Thursday.
U.S. Defense Secretary Lloyd Austin spoke by phone with his Russian counterpart, Sergey Shoygu, for the first time since Feb. 18.
Pentagon press secretary John Kirby said in a statement that Austin 'urged an immediate cease-fire in Ukraine and emphasized the importance of maintaining lines of communication.'
US aid to Ukraine
Austin also spoke Friday with Ukrainian Defense Minister Oleksii Reznikov about Ukraine's 'evolving battlefield needs.'
'Secretary Austin highlighted the President's May 6 announcement of $150 million in Presidential Drawdown Authority to provide Ukraine's Armed Forces with artillery, counter-artillery radars, and electronic jamming equipment,' Kirby said in a statement.
'Minister Reznikov shared his assessment of the situation on the ground in eastern Ukraine.'
War crimes trial
In Ukraine, a 21-year-old Russian soldier was brought before a Kyiv court Friday, in the first war crimes proceeding since the war began.
Ukrainian prosecutors say Vadim Shishimarin fired several shots from a car in the Sumy region of northeastern Ukraine on Feb. 28, just days after the conflict began, killing an unarmed 62-year-old man who was pushing a bike on the side of the road.
Ukraine's government says it is investigating more than 10,000 war crimes involving Russian forces, with cases of torture and mutilation having often been revealed after Russian forces left a Ukrainian city, as in the case of Bucha.
Russia has denied committing war crimes in Ukraine, and the Kremlin on Friday said it had no knowledge of the trial.
In Moscow, Russian President Vladmir Putin on Friday spoke by phone with German Chancellor Olaf Scholz about the stalled Ukrainian-Russian peace talks.
In a tweet, the German leader said he had called during the 75-minute conversation for an immediate cease-fire, countered the Russian claim 'that Nazis are in power' as false and also reminded Putin 'about Russia's responsibility for the global food situation.'
The call came as G-7 ministers meeting in Germany pledged unity and more weapons and aid to Ukraine.
The European Union's foreign policy chief, Josep Borrell, announced an additional $520 million worth of military support to Ukraine for heavy weaponry, while expressing hope that member states would agree to a Russian oil embargo.
British Foreign Minister Liz Truss also announced new sanctions against members of Putin's inner circle, including his former wife and cousins.
VOA Senior Diplomatic Correspondent Cindy Saine contributed to this report. Some information for this story came from The Associated Press and Reuters.