Russia-Ukraine updates: 2 US veterans who joined Ukrainian forces missing

Russia will conduct a "special analysis" and take necessary measures for national security if Finland joins NATO, Kremlin spokesman Dmitry Peskov said Thursday.

"There is an order from the president, the supreme commander-in-chief, that a list of measures be composed to strengthen our western flanks in connection with the strengthening of the eastern flank of NATO," Peskov told reporters during a daily briefing. "NATO has been enlarging towards us. So, clearly, all of that will be elements of a special analysis and the elaboration of measures necessary for maintaining a balance and providing our security."

"Everything will depend on the manifestation of the further [NATO] enlargement process -- how far the military infrastructure will grow towards our borders," he added.

When asked whether Finland's accession to NATO -- the world's biggest military alliance -- would pose a threat to Russia, Peskov told reporters: "Of course it will."

"Another enlargement of NATO does not make our continent more stable and secure," he said.

Peskov's comments followed a joint statement released by Finnish President Sauli Niinisto and Finnish Prime Minister Sanna Marin announcing their support for Finland applying to join NATO.

Finland's leaders announced Thursday their support for the country applying to join NATO, the world's biggest military alliance.

"During this spring, an important discussion on Finland's possible NATO membership has taken place. Time has been needed to let Parliament and the whole society establish their stands on the matter," Finnish President Sauli Niinisto and Finnish Prime Minister Sanna Marin said in a joint statement. "Time has been needed for close international contacts with NATO and its member countries, as well as with Sweden. We have wanted to give the discussion the space it required."

"Now that the moment of decision-making is near, we state our equal views, also for information to the parliamentary groups and parties. NATO membership would strengthen Finland's security," they added. "As a member of NATO, Finland would strengthen the entire defence alliance. Finland must apply for NATO membership without delay. We hope that the national steps still needed to make this decision will be taken rapidly within the next few days."

The Finnish Parliament will now take up the issue, with a vote expected to be held early next week.

The announcement marks a major shift in Finland's traditionally neutral policy, triggered by Russia's ongoing invasion of Ukraine. Finland shares an 830-mile border with Russia, and recent opinion polls show Finnish public support for joining NATO has surged to 76%.

Neighboring Sweden is also considering applying to join the alliance.

-ABC News' Ines de la Cuetara

Despite President Joe Biden saying Monday that Russian President Vladimir Putin doesn't have a "way out," State Department spokesperson Ned Price insisted the U.S. is providing the Kremlin with a "very simple" and "straightforward" exit strategy through genuine diplomacy.

"The State Department, this administration, provided an off ramp well before President Putin decided to launch this war against Ukraine … it has not closed," Price said.

The problem, Price said, was that Russia continues to show no interest in that route.

Price repeated that one area where the U.S. was not willing to give over any ground was the potential expansion of the NATO alliance.

"NATO's open door means an open door. That is important to us and it is nonnegotiable," he insisted.

-ABC News' Shannon Crawford

President Joe Biden said the war in Ukraine is an opportunity for American farmers to step in to address shortages caused by the invasion.

"We can make sure the American agriculture imports will make up for the gap in Ukrainian supplies," Biden told a group at a farm in Illinois on Wednesday.

Biden said to the farmers, "With Putin's war in Ukraine, you're like the backbone of freedom."

The president pointed the finger at Russia for preventing Ukraine from shipping wheat to the rest of the world.

Biden noted: “Ukraine was the world's largest producer of wheat and corn and cooking oil -- but wheat, the largest. … Ukraine says they have 20 million tons of grain in their silos right now ... because of what the Russians are doing in the Black Sea, Putin has warships, battleships preventing access to the Ukrainian ports to get this grain out, to get this wheat out."

“The brutal war launched on Ukrainian soil has prevented Ukrainian farmers from planting next year's crop and next year's harvest,” he added.

-ABC News' Ben Gittleson