In this photo provided by Ukraine's 24th Mechanised Brigade press service, a serviceman of the 24th Mechanised Brigade improves his tactical skills at the training field in Donetsk region, Ukraine, Friday, Nov. 29, 2024. (Oleg Petrasiuk/Ukrainian 24th Mechanised Brigade via AP)
In this photo provided by Ukraine's 24th Mechanised Brigade press service, a serviceman of the 24th Mechanised Brigade improves his tactical skills at the training field in Donetsk region, Ukraine, Friday, Nov. 29, 2024. (Oleg Petrasiuk/Ukrainian 24th Mechanised Brigade via AP)
FILE - Russian President Vladimir Putin gestures while speaking to the media after the summit of the Collective Security Treaty Organization in Astana, Kazakhstan, Nov. 28, 2024. (Mikhail Tereshchenko, Sputnik, Kremlin Pool Photo via AP, File)
European Council President Antonio Costa, left, greets Ukraine's President Volodymyr Zelenskyy, during a press conference in Kyiv, Ukraine, Sunday, Dec. 1, 2024. (AP Photo/Evgeniy Maloletka)
European Council President Antonio Costa hugs Ukraine's President Volodymyr Zelenskyy during a joint press conference, in Kyiv, Ukraine, Sunday, Dec. 1, 2024. (AP Photo/Evgeniy Maloletka)
European Council President Antonio Costa speaks during a joint press conference with Ukraine's President Volodymyr Zelenskyy in Kyiv, Ukraine, Sunday, Dec. 1, 2024. (AP Photo/Evgeniy Maloletka)
In this photo provided by Ukraine's 24th Mechanised Brigade press service, servicemen of the 24th Mechanised Brigade improve their tactical skills at the training field in Donetsk region, Ukraine, Friday, Nov. 29, 2024. (Oleg Petrasiuk/Ukrainian 24th Mechanised Brigade via AP)
Ukraine's President Volodymyr Zelenskyy speaks during a joint press conference with European Council President Antonio Costa, in Kyiv, Ukraine, Sunday, Dec. 1, 2024. (AP Photo/Evgeniy Maloletka)
Ukraine's President Volodymyr Zelenskyy and European Council President Antonio Costa hold a joint press conference in Kyiv, Ukraine, Sunday, Dec. 1, 2024. (AP Photo/Evgeniy Maloletka)
Ukraine's President Volodymyr Zelenskyy and European Council President Antonio Costa arrive for a joint press conference, in Kyiv, Ukraine, Sunday, Dec. 1 2024. (AP Photo/Evgeniy Maloletka)
In this photo provided by Ukraine's 24th Mechanised Brigade press service, a serviceman of the 24th Mechanised Brigade improves his tactical skills at the training field in Donetsk region, Ukraine, Friday, Nov. 29, 2024. (Oleg Petrasiuk/Ukrainian 24th Mechanised Brigade via AP)
In this photo provided by Ukraine's 24th Mechanised Brigade press service, a serviceman of the 24th Mechanised Brigade improves his tactical skills at the training field in Donetsk region, Ukraine, Friday, Nov. 29, 2024. (Oleg Petrasiuk/Ukrainian 24th Mechanised Brigade via AP)
In this photo provided by Ukraine's 24th Mechanised Brigade press service, a serviceman of the 24th Mechanised Brigade improves his tactical skills at the training field in Donetsk region, Ukraine, Friday, Nov. 29, 2024. (Oleg Petrasiuk/Ukrainian 24th Mechanised Brigade via AP)
In this photo provided by Ukraine's 24th Mechanised Brigade press service, a serviceman of the 24th Mechanised Brigade improves his tactical skills at the training field in Donetsk region, Ukraine, Friday, Nov. 29, 2024. (Oleg Petrasiuk/Ukrainian 24th Mechanised Brigade via AP)