Russia attacks Ukraine

Russia on Thursday morning started military attacks on Ukraine, local and international media reported.

Ukraine's Interior Ministry said Russia's "invasion has begun," with reports of troops crossing the border from multiple directions, and explosions in multiple cities including the capital Kyiv, reported Cable News Network (CNN).

A total of 11 airfields, three command posts, a Ukrainian naval base, and 18 radar stations of the S-300 and Buk-M1 air defense missile systems were among the facilities destroyed, reported Xinhua, quoting the Russian Defense Ministry.

Signs of nervousness were growing as planes flew overhead, explosions were heard, and an alarm siren sounded in the Ukrainian capital of Kiev, where citizens were standing in long lines hoping to draw money and stock up on supplies.

In the center of Kiev, the local bus system, subway, banks, supermarkets, pharmacies and hotels were still operating normally. However, many private shops and bookstores have closed.

The United States and the North Atlantic Treaty Organization (NATO) have both denied the possibility of sending troops to Ukraine.

In a televised speech to the nation earlier this day, Putin said, "Our plans do not include the occupation of Ukrainian territories. We are not going to impose anything on anyone by force," noting that Russia's move is in response to "fundamental threats" by NATO, which has expanded to Eastern Europe and brought its military infrastructure closer to Russian borders.

In Kiev, explosions were heard at Boryspil International Airport and other places across the city, according to local media reports. The country's airspace was closed for civilian aircraft, and local authorities were evacuating passengers and staff from the airport.

Ukrainian President Volodymyr Zelensky on Thursday declared martial law in the country following Russia's military operation.

In a video address, Zelensky said his country is under attack. According to the Interior Ministry, military depots and airfields in the capital were hit by missiles.

NATO Secretary General Jens Stoltenberg said Thursday in a press briefing that "we have made it clear that we do not have any plans and intentional deploying NATO troops to Ukraine."

The White House said Wednesday that the United States would not be in a war with Russia or put troops on the ground in Ukraine.

"What I will tell you is the president has been crystal clear and consistent: He is not sending U.S. troops to fight in Ukraine. That has not changed," said White House Press Secretary Jen Psaki during a daily briefing.

Putin on Monday signed two decrees recognizing "the Lugansk People's Republic" and "the Donetsk People's Republic" as independent and sovereign states and deployed "peacekeeping" forces in the two regions.

Seeing it as "a matter of time" for NATO to expand eastward, Putin took military action against Ukraine after recent negotiations with the United States and NATO failed.

Russia will not allow Ukraine to have nuclear weapons, he said Thursday, adding that Russia took action to protect itself from "those who take Ukraine hostage."

In a late-night address Wednesday, Zelensky said he had unsuccessfully sought talks with Putin. "I initiated a telephone call with the president of the Russian Federation. Result: silence."

While mobilizing troops, Russia closed its airspace to civilian aircraft on its western borders with Ukraine and Belarus, the aviation authorities said Thursday.

Additionally, the Russian aviation authority Rosaviatsiya announced that Russia has temporarily closed more than 10 airports in the south and Crimea.

According to the Russian Defense Ministry, the Russian Armed Forces are destroying "military infrastructure, air defense facilities, military airfields, aviation of the Ukrainian Armed Forces" with high-precision weapons, not targeting Ukrainian cities.

Besides Kiev, several military targets in eastern and southern Ukraine were under attack early Thursday, according to the Interfax-Ukraine news agency.

The Ivano-Frankivsk International Airport and its fuel and lubricants depots in western Ukraine were also destroyed by Russia's missile systems, reported Ukrinform, citing the Ukrainian Interior Ministry.

Ukraine's border guard service said Russia's ground forces crossed into Ukraine from several directions on Thursday. Russian tanks and other heavy equipment crossed the frontier in several northern regions and Crimea in the south.

The border guard also said separately that Russian troops had crossed the Ukrainian border into the Chernihiv, Kharkiv and Lugansk regions.

Following Russia's operation, Zelensky announced that Kiev had severed diplomatic relations with Moscow after Russia launched military operations in Donbass, the government-run Ukrinform news agency reported.

In a televised address, Zelensky said that more than 40 people were killed and dozens wounded in the conflict.

In response, the Russian Foreign Ministry said the severance of bilateral diplomatic ties was "not our choice," Sputnik reported.

Shortly after Putin announced the military operation in Ukraine, United Nations Secretary-General Antonio Guterres on Wednesday night called on Russia to withdraw its troops.

If the military action would lead to a generalized war, "it is difficult to forecast how dramatic it will be in the number of people who will die, in the number of people who will be displaced, in the number of people who will lose hope in relation to the future," Guterres told reporters following a Security Council emergency meeting on Ukraine.

To rally the support of his Western allies, Zelensky has reached out to U.S. President Joe Biden and French President Emmanuel Macron by phone.

During the call, Biden briefed his Ukrainian counterpart on the steps Washington is taking "to rally international condemnation," adding that the United States "will continue to provide support and assistance to Ukraine and the Ukrainian people," according to a White House statement.

Biden also said he would meet with leaders of the Group of Seven countries on Thursday.

The United States has announced what it called "the first tranche" of punitive measures on Russia -- sanctions on two major Russian banks and the country's sovereign debt, preventing Moscow from raising money from the West and trading new debt in the U.S. or European markets. It also sanctioned Russian elites and their family members.

Austrian President Alexander Van der Bellen said on Thursday that "everything must now be done to avoid further escalation and to protect lives."

Emphasizing that "peace comes first," Van der Bellen said the way to the negotiating table must be open to all sides.

Guterres on Wednesday night asked Putin to send his troops back to Russia and "give peace a chance" after the Security Council emergency meeting on Ukraine concluded.

China maintains that the Cold War mentality should be completely abandoned and a balanced, effective and sustainable European security mechanism should be finally established through dialogue and negotiation, Chinese State Councilor and Foreign Minister Wang Yi said in a phone conversation with Russian Foreign Minister Sergei Lavrov on Thursday.