Moscow and Helsinki's relations have deteriorated sharply since Finland joined NATO on April 4. -AP
Finland's embassy in Moscow has received a letter containing an unknown powder and has reported the matter to the Russian authorities, Russian news agencies reported on Friday.
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Relations between Moscow and Helsinki have deteriorated sharply since Finland formally joined NATO on April 4, becoming the 31st member of the US-led military alliance. Finland shares a long land border with Russia.
The Finnish embassy received three letters on Thursday, one of which contained a powder, the RIA news agency reported.
Russian police were in the embassy building to investigate the incident with the substance sent off for testing, National News Agency of Ukraine reported.
"In line with the security rules of the Finnish foreign ministry, the letters in question were handed to official representative organs of Russia which will study the matter," RIA quoted the Finnish embassy as saying.
The embassy said it had also informed Russia's foreign ministry of the incident.
Finland's decision to join NATO ended seven decades of strategic non-alignment which began after the country repelled an attempted Soviet invasion during World War II In the postwar period it opted to maintain friendly ties with Moscow.
But Russia's invasion of Ukraine in February 2022 prompted Finns to seek security under NATO's collective defence pact, which states that an attack on one member is an attack on all.
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