President Vladimir Putin said he'd sought an "open dialogue" with the West.
Almost a year after Russian President Vladimir Putin launched a full-scale invasion of neighboring Ukraine, the two countries are engaged in a struggle for control of areas throughout the east and south.
Putin's forces pulled out of key positions in November, retreating from Kherson as Ukrainian troops led a counteroffensive targeting the southern port city. Russian drones have continued bombarding civilian targets throughout Ukraine, knocking out critical power infrastructure as winter sets in.
For previous coverage, please click here.
The U.S. Embassy in Kyiv emailed Americans in Ukraine, warning that they should shelter in place.
"The U.S. Embassy urges US citizens to shelter in place and depart Ukraine now using privately available ground transportation options when it is safe to do so," the email said.
Air raid sirens sounded across Ukraine on Monday morning, as a series of Russian missiles struck civilian targets in Kyiv, Lviv, Kharkiv and other cities.
Russia launched 75 missiles toward Ukraine, Ukraine's Commander-in-Chief of the Armed Forces Valeriy Zaluzhnyi said. Forty-one of those missiles were struck down by air defenses, Zaluzhnyi said.
At least eight people died and 24 were injured in Kyiv, officials said. At least five missiles struck the capital at about 8 a.m. local time.
Missiles hit the capital's central Shevchenkiv District, with explosions near Parliament and other government buildings. Samsung's Ukraine headquarters, which is next to Kyiv's main train station, was damaged. Photos showed smashed glass windows and what appeared to be significant damage.
Power was out in much of Lviv, in western Ukraine, where several explosions were also reported. The mayor said "critical infrastructure" was damaged.
At least six explosions were heard in Kharkiv, where the regional governor urged residents to shelter in place.
-ABC News' Joe Simonetti, Britt Clennett and Ian Pannell
Ukrainian President Volodymyr Zelenskyy on Monday urged Ukrainians to "hold on and be strong" after explosions rocked Kyiv.
"The 229th day of full-scale war. On the 229th day, they are trying to destroy us and wipe us off the face of the earth," Zelenskyy said. "In general. Destroy our people who are sleeping at home in Zaporizhzhia. Kill people who go to work in Dnipro and Kyiv. The air alarm does not subside throughout Ukraine. There are missiles hitting. Unfortunately, there are dead and wounded. Please do not leave shelters. Take care of yourself and your loved ones. Let's hold on and be strong."
-ABC News Joe Simonetti
Several explosions rocked Kyiv's Shevchenko District, a large area in the center of the capital that includes the historic old town as well as several government offices, Mayor Vitali Klitschko said on Monday.
"Several explosions in the Shevchenkiv District -- in the center of the capital," Klitschko said on Telegram. "All services follow in place. Details later."
-ABC News' Will Gretsky
