The prime minister will attend the Munich Security Conference on Saturday, where he will deliver a speech urging allies to remain united in the face of Russian hostility.
The intervention came as 7,000 more troops arrived on the Ukrainian border – a move Vladimir Putin insists is “purely defensive”.
The Prime Minister said: “There is still a chance to avoid unnecessary bloodshed, but it will require a strong demonstration of Western solidarity as we have seen in recent history.
Allies need to speak with one voice to urge President Putin to pay a heavy price for further Russian aggression on Ukraine. Diplomacy may still prevail.
“This is the message I will take to Munich today because we are redoubling our efforts to prevent a serious miscalculation that will destroy Ukraine, Russia and the rest of Europe.”
In his speech, Mr. Johnson will remind partners that, while there is still time to persuade Mr. Putin to withdraw from the Russian military, the only possibility is that if the Western world speaks with one voice. Do it and talk to stop it.
While in Munich, the Prime Minister will also meet with a number of European partners to discuss the current response.
It comes as Russian President Vladimir Putin denied that he was planning to invade Ukraine, even though Moscow had gathered more than 150,000 troops on the border.
Speaking at a news conference with Belarussian President Alexander Lukashenko, Mr Putin said: “These military exercises are purely defensive and do not pose a threat to any other country.
“They were planned and all the objectives of these exercises have been achieved.”
Ukraine-Russia crisis: Edinburgh’s twin city Kiev could soon see carnage …
Speaking through an interpreter, Mr Putin said he had spoken to the West about his demands for “security guarantees” and claimed that those requests had not been met.
He accused Ukrainian authorities of systematic human rights abuses against the Russian-speaking population in the east of the country.
“We also see systematic human rights violations and discrimination against the Russian-speaking population in Ukraine,” he said.
Mr Putin also called Western threats of sanctions a “violation of international law”.
“First of all, the pressure of sanctions is completely unjustified. It is a violation of international law. Therefore, these people only care about international law when it is in accordance with them,” he said.
“We have been living in this parable for many years.
“They will impose a ban in any case, for whatever reason. They will look for a reason.
“We are establishing our economic sovereignty. Even our US allies are dealing with the consequences of sanctions.”
Amid the tensions, Kiev Mayor Vitaly Klitschko also demanded that Germany provide “defense weapons” to Ukraine.
Addressing German Foreign Minister Analina Beerbok, Mr Klitschko said: “I would like to thank all the friends who support Ukraine in this very difficult situation, who believe that without your support Ukraine cannot survive. Can live
“We need defensive weapons right now.
“Thanks to Germany for billions of dollars rebuilding infrastructure in Ukraine, but now, in this critical situation, we [are] In front of one of the strongest armies in the world.
“Every attacker who thinks about invading Ukraine must understand that he has to pay a painful price.
“We are ready to fight. We are ready to defend our families, our state, our cities, our citizens. We need help.
“Thanks for the 5,000 helmets, but that’s not enough. We can’t just defend our country with it.”
The Netherlands plans to send military equipment to Ukraine, including rifles, ammunition, radar systems and mine detection robots.
The leader of rebel-held Donetsk in eastern Ukraine also claimed on Friday that people would be evacuated from Russia.
Denis Peshilin, head of the self-proclaimed Donetsk People’s Republic (DNR), announced on social media that Russia had agreed to prov
ide housing for those leaving.
Ukrainian Foreign Minister Dmitry Koliba has vehemently denied “propaganda reports” that the army is planning an attack. U.S. officials say they believe the escalating violence in the Donbass region could be part of a Russian excuse to invade Ukraine.
On Friday, Home Office Secretary Damian Hinds also warned that the West needed to “spread” misinformation from the Kremlin, following US President Joe Biden and Mr Johnson’s claims that Russia was the so-called “false flag”. Intends to use the operation as an excuse. An attack.
On Thursday morning, a kindergarten in the Ukrainian separatist-controlled Donbass region was shelled, with both the Russian and Ukrainian governments claiming responsibility.
Leaders of NATO states, including the prime minister, have said the incident was designed by the Russians to lay the groundwork for a war – a kind of misinformation campaign called a false flag operation.
Mr Biden said there was “every sign” that Russia was ready for war, despite claims that the Kremlin was withdrawing troops from the border.
Mr Hinds said: “The false flag is a form of misinformation. There are other forms of misinformation.
The minister told Times Radio: “We need to stick to it. We need to understand what could happen, what could be used to justify an attack, any kind of fake justification for an attack. And things should not be taken for granted. “
Mr Hinds said an attack on Ukraine was “not inevitable” but could happen “at any time”, urging Russia to take the “diplomatic route”.
He said: “Many, many troops have been formed on the Ukrainian border. There is no sign of a fall behind it, contrary to what has been claimed.
“Troops are in place and there could be an attack, an incursion at any time, but it could take a long time.”