May 23, 2023 - Russia-Ukraine news

Supporting Ukraine by training pilots on F-16 fighter jets “does not make NATO and NATO allies party to the conflict,” the alliance’s Secretary-General Jens Stoltenberg said on Tuesday. 

Speaking to reporters in Brussels ahead of an EU defense ministers meeting, the alliance chief welcomed the decision by several NATO allies to start training Ukrainian pilots on F16 fighter jets.

Stoltenberg continued to say that “the right of self-defense is enshrined in the UN charter. We help Ukraine to uphold that right. That is our right to help them protect UN law, international law, against the war of aggression. That doesn’t make NATO and NATO allies party to the conflict, but we are supporting Ukraine to defend themselves against a war of aggression, a brutal invasion by President Putin.” 

Some background: President Joe Biden informed G7 leaders Friday that the US supports a joint effort with allies and partners to train Ukrainian pilots on fourth generation aircraft, including F-16s, a senior administration official told CNN.

Following Biden's backing of Ukrainian pilots training to fly F-16s, Russia’s deputy foreign minister warned Western countries of “enormous risks” if Ukraine is provided with F-16 fighter jets, Russian state media TASS reported Saturday.

"In any case, this will be taken into account in all our plans, and we have all the necessary means to achieve the set goals," Alexander Grushko said.

CNN's Darya Tarasova and Natasha Bertrand contributed to this post.

Part of the beleaguered city of Bakhmut remains under Ukrainian control, the country’s national security adviser Oleksiy Danilov told CNN on Tuesday. 

“If they [Russians] believe they have taken Bakhmut, I can say that this is not true. As of today, part of Bakhmut is under our control,” Danilov told CNN Senior International Correspondent Frederik Pleitgen in an exclusive interview on Tuesday. “I can't say that all of it, but part of Bakhmut is still under our fire.”

Danilov went on to defend Kyiv’s decision to hold on to the city for as long as possible.

“It was our strategic defense operation, which was successful for us, given that we held the territory for 10 months, where we were destroying them every day,” he added. “They could not take Bakhmut for 10 months. What can they boast about?”

Some background: Wagner group chief Yevgeny Prigozhin claimed this weekend that his troops had captured “all the territories they promised to capture, to the last square centimeter.” But Ukraine’s deputy defense minister Hanna Maliar said Ukrainian forces still occupy “a small part of the city,” but that fighting had “decreased” on Tuesday.

On the timing of Ukraine's long-awaited counteroffensive, Danilov said President Volodymyr Zelensky will have the final say.

“We are working according to our plan, we have it. We are clearly aware of when, where, how and what should start,” he said. “The final decision is up to the President, meeting of (the Commander-in-Chief's) staff.”

“When the decision is made, Russia will definitely feel it,” he concluded.

Ukraine’s top national security official told CNN that those responsible for the cross border-raid in Belgorod are Russians who want to get rid of the darkness in their country, denying any involvement from Kyiv.

“They are Russians, it is their country and they have the right to be there,” Oleksiy Danilov, secretary of Ukraine's National Security and Defense Council, told CNN's Frederik Pleitgen in an exclusive interview on Tuesday. “There are some Russians who are on the side of the light and who went to deal with the darkness that exists in Russia now.”

Danilov rejected accusations of Ukrainian involvement levied by Moscow against Kyiv and said the incident in Belgorod was solely a Russian matter.

“There are events happening there that are related to a sector that, in our opinion, should be commented on either by the supreme commander-in-chief, i.e. Putin, or by the Defense minister or someone else,” he said. “They are citizens of the Russian Federation.”

Remember: On Monday, Ukraine confirmed that the group behind the incursion was made up of Russian nationals. The attack was carried out by a group that was "part of the defense and security forces" in Ukraine but acting as “independent entities” in Russia, according to Andriy Yusov, a representative of Ukraine’s defense intelligence agency.

There have been no new incursions by fighters crossing the Ukrainian border into the Borisovsky district in Russia's Belgorod region Tuesday, according to the Belgorod governor.

“Reports are coming from the Borisovsky district: the village of Bogun-Gorodok, the farm Lozovaya Rudka and the village of Tsapovka. According to our information, there was shelling from the Armed Forces of Ukraine, there were [strikes],” regional governor Vyacheslav Gladkov said on Telegram.

“Some telegram channels are starting to interpret this information as the sabotage and reconnaissance group entry and trying to make people panic. There was no entry. The FSB, the Ministry of Emergency Situations and the Ministry of Defense do not confirm this information. The military is working,” he said.

Some background: On Monday, a group of anti-Putin Russian nationals – who are aligned with the Ukrainian army – claimed responsibility for an attack in Russian’s southwestern region of Belgorod, as Moscow said it was fighting a group of saboteurs there.

In a Telegram post, groups calling themselves the “Freedom for Russia Legion” and “Russian Volunteer Corps” said they had “liberated” a settlement in the Belgorod region, which borders Ukraine.

On Monday, the Freedom for Russia Legion made its most decisive move since the war began, launching a cross-border attack on the Russian region of Belgorod.

But it has been defending Ukraine from Moscow’s invading troops for months. CNN’s Sam Kiley met members of the Legion fighting in Bakhmut in December to understand more about what has led Russian nationals to fight for Ukraine in the war.

One soldier, who goes by the call-sign Caesar, told CNN that defending Bakhmut against his Russian motherland is an almost religious imperative.

“From the first day of the war, my heart -- the heart of a real Russian man, a real Christian -- told me that I had to be here to defend the people of Ukraine,” Caesar said.

When he sees invading Russian troops in his gunsights, he feels no ties to his countrymen.

And when the war is over, members of the Legion have more ambitious targets in sight.

His claims echoed those made by members of the legion in a video posted Monday.

Read and watch our full report here.

Around 100 civilians have been evacuated from the Russian border settlements of Glotovo and Kozinka in the Belgorod region, local authorities say. 

The regional governor of Belgorod, Vyacheslav Gladkov, said on his Telegram channel:

On Monday, a group of anti-Putin nationalists claimed to have “liberated” the settlement of Kozinka, home to a crossing station close to Russia’s border with Ukraine. 

Earlier on Tuesday, Gladkov said that both Kozinka and Glotovo had come under mortar and artillery fire the previous day.

In an exclusive report, CNN joined a group of British explosives and counter-insurgency specialists as they passed on decades of bomb making know-how to frontline Ukrainian troops. But it’s not just their subversive skills and techniques that these British-Irish experts are bringing – it’s the bomb components too.

Much of the focus in recent months has been on Ukraine’s demand for heavy military hardware: tanks, jets, rocket launchers and missiles.

But sometimes the biggest help can come in the smallest packages: sophisticated switches, specialized microchips, night vision goggles, covert monitoring devices, even 3D printers.

An officer in the Armed Forces of Ukraine, known as “Skif,” told CNN this equipment is used “to produce explosive devices we can use on the ground, on the battlefield, or in the air as munition for drones.”

Watch Nic Robertson's report here:

Belgorod’s governor says the Russian region bordering Ukraine was hit by drone attacks overnight, following the cross-border attack launched by anti-Putin Russian nationals on Monday. Meanwhile, Ukraine says it’s still holding on to part of Bakhmut – despite Wagner chief Yevgeny Prigozhin’s claims to the contrary.

Here are the latest developments:

The fighters who crossed from Ukraine into Russia’s western Belgorod region on Monday have been pushed back into Ukrainian territory, the Russian Ministry of Defense said in a daily briefing on Tuesday. 

The ministry said on Monday, “after intensive artillery shelling of the Kozinka international checkpoint, as well as a number of other civilian facilities in the Graivoronsky district of the Belgorod region, a unit of the Ukrainian nationalist formation invaded the territory of the Russian Federation.” 

Russia repelled the attackers using air strikes, artillery fire and military units, it said, adding: “The remnants of the nationalists were driven back to the territory of Ukraine, where they continued to be hit by fire until they were completely eliminated.” 

Some context: While Russia has referred to the group or groups that crossed into Russia as "Ukrainian," the attack has been claimed by the Freedom for Russia Legion and Russian Volunteer Corps – two groups of anti-Putin Russian nationals who are fighting in Ukraine as part of Kyiv’s defense forces. Ukrainian officials have acknowledged that the groups crossed into Russia but say they were acting independently.  

Around two hours before the ministry’s briefing, the Freedom for Russia Legion posted on Telegram: “The Legion and the RDK [Russian Volunteer Corps] continue to liberate the Belgorod region!”