"In the next few days I will be in Kyiv at the invitation of Volodymyr Zelensky," Tusk wrote on the X social media platform on Monday.
"At this critical time, Ukraine cannot be left all alone," he added.
Zelensky said on Sunday that Russia had launched more than 980 attack drones, nearly 1,100 guided aerial bombs and two missiles against Ukraine over the past week.
He also warned of Russian attempts to disrupt logistics and transport links between cities and communities.
Ukraine continues to grapple with the effects of sustained Russian strikes on energy infrastructure, which for months has been a primary target.
Electricity supplies remain severely limited across the country, and Kyiv has experienced prolonged outages of power and heating, forcing residents to cope with harsh winter conditions.
International aid has continued to flow to Ukraine. Last week, Poland’s Government Strategic Reserves Agency delivered another batch of power generators.
Kyiv also received the first shipment of generators purchased under the "Warmth from Poland for Kyiv" fundraising campaign, which has collected nearly PLN 9.5 million (EUR 2.25 million), with organizers aiming to raise PLN 10 million.
The European Union has announced its largest-ever winter aid package for Ukraine, including 500 generators and EUR 50 million in energy aid.
Diplomatic efforts to end the war are also continuing. In late January, trilateral talks involving US, Russian and Ukrainian officials began in Abu Dhabi, the capital of the United Arab Emirates.
Zelensky described the discussions as "constructive."
They marked the first time envoys of US President Donald Trump met simultaneously with negotiators from both Ukraine and Russia, after earlier holding separate talks with each side.
Another round of negotiations is expected to take place on Wednesday and Thursday.
Russia launched its full-scale invasion of Ukraine on February 24, 2022. The fourth anniversary of the invasion falls later this month.
(gs)
Source: IAR, PAP