A dozen leaders from Europe and Canada visited Ukraine's capital Monday to mark three years since Russia's invasion, in a show of continued support from some of Kyiv's most important backers.

Fresh possibilities have emerged for President Vladimir V. Putin of Russia with a change of power in Washington.

Russia’s invasion of Ukraine, which marks its third year on February 24, has been a geopolitical earthquake, shaking the decades-old international order. The ramifications for Russian citizens have been far from uniform,