After a number of drone sightings near European airports and military bases, mysterious aircraft were seen over Ireland as Ukraine's Zelenskyy visited.

Ukraine’s top negotiator is scheduled on Thursday to meet in Florida with U.S. special envoy Steve Witkoff, two days after the American's high-stakes meeting with Russian President Vladimir Putin in Moscow, according to a senior administration official.

The European Union has unveiled a plan to use frozen Russian assets to support Ukraine over the next two years.

Col. Gen. Vladimir Chirkin said Moscow's leadership was "unprepared" and misled into thinking 70% of Ukrainians supported Russia.

In a disused warehouse at an undisclosed location in Ukraine, a military drone instructor who goes by the call sign "DC" showed CBS News a makeshift practice course that students must learn to fly the increasingly indispensable devices through before they join the country's defense against Russia.

Ukraine has condemned two-time Olympic diver Sofiia Lyskun's switch to represent Russia and will try to strip her of awards. Lyskun, 23, told the Russian newspaper Izvestia this week that “coaches’ incompetence” was a factor in her decision.

Previous diplomatic attempts to break the deadlock have come to nothing and the nearly four-year war has continued unabated.

Sweden will phase out development aid to five countries in coming years and use the money to increase support for Ukraine, the government said on Friday.