Russian President Vladimir Putin is stalling at the peace table while preparing a new military offensive in Ukraine, two senior U.S. senators warned Sunday, arguing that the next two weeks could shape the future of a war that has already smashed cities,

Russia and Ukraine will resume direct peace talks in Istanbul a day after Ukraine staged one of its boldest aerial attacks inside Russia, which destroyed long-range bombers and other aircraft. Ukrainian Defense Minister Rustem Umerov will lead the talks Monday opposite a delegation headed by Russian presidential aide Vladimir Medinsky.

President Volodymyr Zelenskyy said Defense Minister Rustem Umerov would sit down with Russian officials at the second round of peace talks on Monday.

With 41 military aircraft impacted, the Ukrainian drone attack was described by some commentators as Russia's "Pearl Harbor." The attack on Pearl Harbor in December 1941 was a surprise air raid by Japan on the U.S. during World War II. Kyiv's assault follows ground advances by Moscow troops in recent days in Ukraine's Sumy border region.