The overnight strike on the Tudora-Starokozacze crossing, in the early hours of 9 September, hit the Ukrainian side of the post and damaged its infrastructure, temporarily halting operations, Moldovan authorities said.
Two more drones landed nearby. Two Ukrainian nationals were killed and several people were hurt, including one Moldovan citizen.
Moldova's foreign ministry accused Russia of deliberately targeting the crossing and of trying to justify the strike with false claims that weapons were being moved from Moldova into Ukraine. Chisinau condemned the attack Wednesday and voiced solidarity with Kyiv.
Speaking in Bratislava after talks with the leaders of the Visegrad Group, Tusk linked that attack to what he described as a broader pattern of Russian provocations targeting crossing points along Ukraine's borders — one he said Poland should expect to face as well.
"We expect this type of action also regarding the border crossings with Ukraine in other countries, including Poland", Tusk said.
He said the warning had already materialised closer to home: overnight Thursday, cooperation between Polish and Ukrainian services prevented a similar threat from reaching one of Poland's own crossings.
"We unfortunately had a warning sign of this, it ended happily, but we must be prepared for various provocations of this kind, including internal sabotage", he said.
Tusk tied the incident to intelligence he said he had received hours earlier: "a fairly precise report directly from CIA Director John Ratcliffe concerning possible events in the coming months".
He said the warning was consistent with what he had been telling Poles for months. "As I have already said and warned for many months, various scenarios should be expected. Poland and the whole of Europe must be prepared for different scenarios, not only regarding the situation on the Russian-Ukrainian front but also on the European Union's eastern flank", Tusk said.
The briefing came against the backdrop of continued US-Russia intelligence contacts. Ratcliffe travelled to Moscow on 25 August for talks with Russian Foreign Intelligence Service chief Sergei Naryshkin and Federal Security Service director Alexander Bortnikov.
Poland's minister coordinator of special services, Tomasz Siemoniak, said Tuesday he had held a "very important conversation" with the CIA chief, without disclosing its content.
Pressed on Poland's position, Tusk argued the country was not looking to Brussels for help but shouldering a burden on the bloc's behalf.
"It is not that Poland needs the European Union's help in this matter — we are carrying out the most difficult task at the moment for the whole of Europe, not only for ourselves. Forgive me for putting it bluntly — no one here is doing anyone a favour, we all have to take care of this together. Because this is a matter of security for the whole Union", he said.
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Source: Polish Radio