COPENHAGEN, Denmark (AP) — The head of the European Union’s executive branch said Friday that Finland’s decision to close its border crossings with Russia over a surge in migrants was a security matter for the whole 27-member bloc to consider.

European Commission President Ursula von der Leyen made the remarks during a trip to the frontier, visiting a part of the border located in southeastern Finland.

“We all know how (Russian President Vladimir) Putin and his allies instrumentalize migrants to test our defenses and to try to destabilize us,” von der Leyen said. “Now Putin is focusing on Finland, and this is no doubt in response to your firm support of Ukraine and your accession to NATO.”

On April 4, Finland decided to extend the closure of its border crossing points with Russia “until further notice” because of what the government says is a high risk of organized migration being orchestrated by Moscow. Finland’s government has closed eight of its nine checkpoints with Russia. The only one that remains open is dedicated to rail travel only, and cargo trains mainly run through it.