KYIV, Ukraine (AP) 鈥 Russia launched 10 Shahed and decoy drones at Ukraine in nighttime attacks, the Ukrainian air force said Tuesday, in its smallest drone bombardment this year as the warring countries prepare for possible peace talks in Turkey.

The Kremlin hasn鈥檛 directly responded to Ukrainian President Volodymyr for Russian leader Vladimir Putin to meet him in person at the negotiations in Istanbul on Thursday.

Kremlin spokesman Dmitry Peskov refused for the second straight day Tuesday to tell reporters whether Putin will travel to Istanbul and who else will represent Russia at the potential talks. 鈥淎s soon as the president considers it necessary, we will make an announcement,鈥 Peskov said.

Russia has said it will send a delegation to Istanbul without preconditions.

The U.S. has been applying stiff pressure on both sides to come to the table since President Donald Trump came to power in January with .

Military analysts say both sides are preparing a spring-summer campaign on the battlefield, where a war of attrition has killed tens of thousands of soldiers on both sides along the roughly 1,000-kilometer (620-mile) front line. The Institute for the Study of War, a Washington think tank, said Monday that Russia is 鈥渜uickly replenishing front-line units with new recruits to maintain the battlefield initiative.鈥

Zelenskyy will not be meeting with any Russian officials in Istanbul other than Putin, Mykhailo Podolyak, an adviser to Zelenskyy, said Tuesday on a YouTube show run by prominent Russian journalists in exile.

Lower-level talks would amount to simply 鈥渄ragging out鈥 any peace process, Podolyak said. European leaders have recently accused Putin of dragging his feet in peace efforts while he attempts to press his bigger army鈥檚 battlefield initiative and capture more Ukrainian land.

Russia effectively rejected an demanded by Ukraine and Western European leaders from Monday, when it fired more than 100 drones at Ukraine. Putin instead offered direct peace talks with Ukraine in Istanbul on Thursday.

Russia shunned the ceasefire proposal tabled by the U.S. and European leaders but offered direct talks with Ukraine.

Putin has repeatedly of the Ukrainian government, especially Zelenskyy himself, saying his term expired last year. Under Ukraine鈥檚 constitution, it is illegal for the country to hold national elections while it鈥檚 under martial law, as it now is.

In a further complication, a Ukrainian rules out negotiations with Putin.

U.S.鈥疭ecretary of State Marco Rubio spoke Monday with the top diplomats from the United Kingdom, France, Germany and Poland, who were meeting in London, to assess 鈥渢he way forward for a ceasefire and path to peace in Ukraine,鈥 spokesperson Tammy Bruce said.

Those European countries had pledged further sanctions on Russia if it didn鈥檛 comply with a full ceasefire that Ukraine had accepted from Monday, but they made no announcement of additional punitive measures.

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