Prime Minister Petteri Orpo (NCP) has criticised Hungary's "blackmailing" tactics ahead of an EU leaders' summit in Brussels on Thursday.
Hungary has resisted the EU's plans to provide Kyiv with a 54- billion-euro aid package, and has also strongly opposed a proposal to invite Ukraine to begin formal negotiations to join the bloc.
Each member state has a veto on these matters, meaning Hungary can block both the aid package and the invitation to accession talks.
Speaking to Finnish media on Thursday morning, Orpo said the summit offered a "historic" opportunity.
"What we decide, or do not decide, at this meeting will send a clear message to Kyiv, Moscow, Washington and Beijing," Orpo noted, adding that Finland has one main goal for the summit: "it's that we make strong decisions to show we support Ukraine."
The Hungarian government has been in a long-running dispute with its European Union partners. The EU Commission took the decision in December last year to block about 22 billion euros in cohesion funds unless Budapest made some domestic improvements, for example strengthening the independence of its judiciary.
Earlier this week, the Commission unblocked about 10 billion euros of this funding, a move widely seen as a concession to Hungarian PM Viktor Orbán over his opposition to Ukraine aid and EU membership.
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