The defence ministers for the four EU and NATO member states, which all share a border with Russia, said in a joint statement that military threats "have significantly increased".

The four countries have ramped up defence spending and training since Russian troops invaded Ukraine in 2022, voicing fears that Russia could target them next.

"In light of this unstable security environment marked by Russia's aggression and its ongoing threat to the Euro-Atlantic community, it is essential to evaluate all measures to strengthen our deterrence and defence capabilities," the statement said.

"We... unanimously recommend withdrawing from the Ottawa Convention," it said, referring to the anti-landmine treaty.

"Despite our withdrawal, we will remain committed to international humanitarian law, including the protection of civilians during an armed conflict," it added.

Poland's Defence Minister Wladyslaw Kosiniak-Kamysz called the move "a very strong political declaration showing how determined we are to defend our homeland."

"Finland is also considering such a decision, so I think that soon all the countries... in the northeastern region of NATO's flank will make a similar decision," Kosiniak-Kamysz told reporters.

More than 160 countries and territories are signatories to the Ottawa Convention, including Ukraine but not the United States or Russia.

The treaty bans signatories from acquiring, producing, stockpiling or using anti-personnel mines, which are designed to be buried or hidden on the ground.

They often mutilate victims, who are not immediately killed, and aid groups decry their long-term impact on civilians.

Lithuania earlier this month quit another treaty banning cluster bombs citing security concerns over the threat from Moscow, sparking outrage from human rights watchdogs.

Amnesty International called the move "disastrous", while Human Rights Watch said it was "alarming", and the International Committee of the Red Cross (ICRC) warned it "weakens vital protections for civilians".

- 'Committed' to international law -

Lithuanian Defence Minister Dovile Sakaliene said on Tuesday her country was already considering what type of mines -- and how many of them -- it should buy.

"I think we will certainly have a range of options: both anti-tank and anti-personnel mines have been considered," Sakaliene said.

Lithuania's parliament speaker Saulius Skvernelis said that the decision on mines was necessary "given the length of the border with countries that are not friendly to us and what is happening in Ukraine".

Lithuania shares a border with Russia and its ally Belarus.

Belarus was used by Russian troops as a launch point for the invasion of Ukraine.

"The enemy that is fighting, unfortunately, is not bound by any conventions," Skvernelis said.

Latvia in a statement said that it could produce mines but "any possible acquisition, deployment and use of unguided anti-personnel mines will be based on military logic and defence capability development priorities".

Estonian Defence Minister Hanno Pevkur said his country currently had no plans to use anti-personnel mines at the moment.

"Estonia and our regional allies remain committed to upholding international humanitarian law and the protection of civilians, even after withdrawing from the Ottawa Convention," he added.

Withdrawal from the convention needs to be approved by national parliaments before other signatories are notified.

The withdrawal comes into effect six months after parliamentary approval.