Ukraine President Volodymyr Zelenskiy on Monday called on the country's people to fly flags and sing the national anthem in unison on Feb. 16, a date that some Western media say Russian could invade, Reuters reported.

Ukrainian government officials stressed that Zelenskiy was not predicting an attack on Wednesday, but responding skeptically to the foreign media reports.

"They tell us Feb. 16 will be the day of the attack. We will make it a day of unity," Zelenskiy said in a video address to the nation.

"They are trying to frighten us by yet again naming a date for the start of military action," Zelenskiy said. "On that day, we will hang our national flags, wear yellow and blue banners, and show the whole world our unity."

Zelenskiy has long said that, while he believes Russia is threatening to attack his country, the likelihood of an imminent invasion has been overstated by Western allies, responding to Moscow's efforts to intimidate Ukraine and sow panic.

Mykhailo Podolyak, an adviser to Zelenskiy's chief of staff, told Reuters the president was responding in part "with irony" to media reports of the potential date of the invasion.

"It is quite understandable why Ukrainians today are skeptical about various 'specific dates' of the so-called 'start of the invasion' announced in the media," he said. "When the 'start of the invasion' becomes some sort of rolling tour date, such media announcements can only be taken with irony."

Zelenskiy's office released a decree calling for all villages and towns in Ukraine to fly the country's flags on Wednesday, and for the entire nation to sing the national anthem at 10 a.m. It also called for an increase in salaries of soldiers and border guards.

U.S. officials said they were not predicting an assault ordered by Russian President Vladimir Putin on a specific day, but repeated warnings that it could come at any time.

"I won't get into a specific date, I don't think that would be smart. I would just tell you that it is entirely possible that he could move with little to no warning," Pentagon spokesperson John Kirby told reporters. Earlier, Kirby said Moscow was still adding to its military capabilities on the Ukrainian frontier.

Secretary of State Antony Blinken said Washington, which has already sent most of its diplomats home, was moving its remaining diplomatic mission in Ukraine from Kyiv to the western city of Lviv, much further from the Russian border. He cited a "dramatic acceleration in the buildup of Russian forces".

Blinken said Washington was offering Ukraine up to $1 billion in sovereign loan guarantees to calm markets. 

The State Department issued a travel advisory recommending that U.S. citizens leave Belarus, which borders both Russia and Ukraine.

More about: