Estonia's Foreign Ministry said on Monday it summoned Russia's charge d'affaires over a Russian vessel's breach of Estonian territorial waters.
Foreign Minister Margus Tsahkna said on X the Baltic state "summoned Russia's charge d'affaires to issue a formal protest regarding this serious and unacceptable violation of our maritime border."
The Estonian army said in a statement that an unauthorized Russian border guard vessel briefly entered the country's territorial waters by up to half a kilometer on Saturday.
Foreign warships can sail through Estonian waters only if conducting a peaceful passage and if they notify the Foreign Ministry 48 hours in advance.
"The Russian vessel did not do so," the army said, adding that this was the first time this year that a Russian ship violated Estonia's maritime border.
According to the Foreign Ministry, a Russian fighter jet violated Estonian airspace in May.
Tensions have escalated between the two countries since Russia invaded Ukraine in 2022.
Estonia, a member of the European Union and NATO, has been a staunch ally of Kyiv since the war began.
Russia has not had an ambassador in Tallinn since February 2023, when Estonia ordered the Russian envoy to leave in a tit-for-tat move.
A Message from The Moscow Times:
Dear readers,
We are facing unprecedented challenges. Russia's Prosecutor General's Office has designated The Moscow Times as an "undesirable" organization, criminalizing our work and putting our staff at risk of prosecution. This follows our earlier unjust labeling as a "foreign agent."
These actions are direct attempts to silence independent journalism in Russia. The authorities claim our work "discredits the decisions of the Russian leadership." We see things differently: we strive to provide accurate, unbiased reporting on Russia.
We, the journalists of The Moscow Times, refuse to be silenced. But to continue our work, we need your help.
Your support, no matter how small, makes a world of difference. If you can, please support us monthly starting from just $2. It's quick to set up, and every contribution makes a significant impact.
By supporting The Moscow Times, you're defending open, independent journalism in the face of repression. Thank you for standing with us.

Remind me later.