Foreign Minister Pekka Haavisto (Green) on Saturday said that the threshold for Finland seeking Nato membership may grow in the future if Finland does not attempt to join now.
He said the Ukraine war has forced Finland to reevaluate its security policy.
Speaking on Yle TV1's Ykkösaamu chat show, the Finnish foreign minister said it was difficult to imagine a more dramatic shift in the European security environment.
"What worse thing would still have to happen for Finland to at least consider Nato," he asked.
Green Party leader Maria Ohisalo has also recently come out in favour of Finland joining the western military alliance.
Debate in Finland has swirled around what types of defence guarantees Finland would have during a potential application process. Finland is currently a partner to Nato, and is subsequently not covered under Article 5, which proposes that an attack against one member is considered an attack against all.
Haavisto told Yle that Finland would have to rely on its own defence capabilities during a potential bid to join the alliance.
Parliamentary debate on Nato membership kicked off in the Finnish legislature this week. These discussions will culminate in whether or not Finland opts to join the alliance. An Yle analysis on Saturday found that the majority of MPs—114—support Finnish Nato membership. The portion of those in favour is expected to grow as more Social Democratic and Centre Party parliamentarians reveal their stance.
Russia has warned both Finland and Sweden of "consequences" for joining Nato.
Haavisto told Yle TV1 it would be good for the two neighbours to synchronize their decisions regarding Nato membership. He, however, noted that Finland as a "sovereign state makes its own security and defence decisions."
The Finnish Reserve Officers' Federation (FROF) on Saturday said it supported a Finnish Nato bid. Swedish People's Party chair and Justice Minister Anna-Maja Henriksson also emphasised the importance of membership in the alliance at a party council meeting in Kokkola on Saturday.
"A military attack on our country should be unattractive to the point that no one would consider it," Henriksson said in a statement.
President Niinistö has said Finland will likely make a decision on Nato membership well before the alliance's summit in Madrid, set to take place at the end of June.