Ukrainian musician Sviatoslav Vakarchuk listens to an instructor as he takes part in a massive training on first aid conducted by charitable foundations SMART Medical Aid and Together for Ukraine Foundation, next to the Lviv National Opera, amid Russia's invasion of Ukraine, in Lviv, Ukraine May 27, 2022. REUTERS/Pavlo Palamarchuk 

U.S. army instructors take part in the Georgian Independence Day celebrations in Tbilisi, Georgia May 26, 2022. REUTERS/Irakli Gedenidze 

Fitness instructor Claire Vandaele poses during an interview with Reuters in Madrid, Spain, May 16, 2022. REUTERS/Isabel Infantes 

Fitness instructor Claire Vandaele exercises following an interview with Reuters in Madrid, Spain, May 16, 2022. REUTERS/Isabel Infantes 

Fitness instructor Claire Vandaele exercises following an interview with Reuters in Madrid, Spain, May 16, 2022. REUTERS/Isabel Infantes 

Fitness instructor Claire Vandaele speaks during an interview with Reuters in Madrid, Spain, May 16, 2022. REUTERS/Isabel Infantes 

Fitness instructor Claire Vandaele exercises following an interview with Reuters in Madrid, Spain, May 16, 2022. REUTERS/Isabel Infantes 

Fitness instructor Claire Vandaele exercises following an interview with Reuters in Madrid, Spain, May 16, 2022. REUTERS/Isabel Infantes 

Fitness instructor Claire Vandaele speaks during an interview with Reuters in Madrid, Spain, May 16, 2022. REUTERS/Isabel Infantes 

A instructor from Mines Advisory Group (MAG) shows displaced Boko Haram victims how to identify dangerous objects during a safety training workshop at the Gubio camp in Maiduguri, Nigeria May 6, 2022. Picture taken May 6, 2022. REUTERS/Afolabi Sotunde 

Professional diver and coral reef conservationist Luis Muino cleans the coral nursery from algae in Playa Coral beach, Cuba April 29, 2022. Picture taken on April 29, 2022. REUTERS/Alexandre Meneghini 

Professional diver and coral reef conservationist Luis Muino shows a piece of coral in Playa Coral beach, Cuba April 29, 2022. Picture taken on April 29, 2022. REUTERS/Alexandre Meneghini 

Professional diver and coral reef conservationist Luis Muino cleans the coral nursery from algae in Playa Coral beach, Cuba April 29, 2022. Picture taken on April 29, 2022. REUTERS/Alexandre Meneghini 

A view of a coral nursery structure made of plastic plumbing in Playa Coral beach, Cuba April 29, 2022. Picture taken on April 29, 2022. REUTERS/Alexandre Meneghini 

Professional diver and coral reef conservationist Luis Muino cleans the coral nursery from algae in Playa Coral beach, Cuba April 29, 2022. Picture taken on April 29, 2022. REUTERS/Alexandre Meneghini 

Professional diver and coral reef conservationist Luis Muino cleans the coral nursery from algae in Playa Coral beach, Cuba April 29, 2022. Picture taken on April 29, 2022. REUTERS/Alexandre Meneghini 

Professional diver and coral reef conservationist Luis Muino cleans the coral nursery from algae in Playa Coral beach, Cuba April 29, 2022. Picture taken on April 29, 2022. REUTERS/Alexandre Meneghini 

Swimming instructor Mario Venerio helps would-be migrants to stretch during a swimming class in anticipation of the dangerous crossing of the Rio Grande River at the U.S. border, at a recreation center in Esteli, Nicaragua April 22, 2022. Picture taken April 22, 2022. REUTERS/Maynor Valenzuela 

Swimming instructor Mario Venerio teaches would-be migrant Martha Martinez to swim in anticipation of the dangerous crossing of the Rio Grande River at the U.S. border, at a recreation center in Esteli, Nicaragua April 22, 2022. Picture taken April 22, 2022. REUTERS/Maynor Valenzuela 

Swimming instructor Mario Venerio teaches would-be migrant Martha Martinez to swim in anticipation of the dangerous crossing of the Rio Grande River at the U.S. border, at a recreation center in Esteli, Nicaragua April 22, 2022. Picture taken April 22, 2022. REUTERS/Maynor Valenzuela 

Swimming instructor Mario Venerio talks to would-be migrants learning to swim in anticipation of the dangerous crossing of the Rio Grande River at the U.S. border, at a recreation center in Esteli, Nicaragua April 22, 2022. Picture taken April 22, 2022. REUTERS/Maynor Valenzuela 

Swimming instructor Mario Venerio talks to would-be migrants learning to swim in anticipation of the dangerous crossing of the Rio Grande River at the U.S. border, at a recreation center in Esteli, Nicaragua April 22, 2022. Picture taken April 22, 2022. REUTERS/Maynor Valenzuela 

Swimming instructor Mario Venerio teaches would-be migrant Martha Martinez a first aid measure for drowning in anticipation of the dangerous crossing of the Rio Grande River at the U.S. border, at a recreation center in Esteli, Nicaragua April 22, 2022. Picture taken April 22, 2022. REUTERS/Maynor Valenzuela 

Swimming instructor Mario Venerio talks to would-be migrants learning to swim in anticipation of the dangerous crossing of the Rio Grande River at the U.S. border, at a recreation center in Esteli, Nicaragua April 22, 2022. Picture taken April 22, 2022. REUTERS/Maynor Valenzuela 

Swimming instructor Mario Venerio teaches would-be migrant Eddy Hurtado to swim in anticipation of the dangerous crossing of the Rio Grande River at the U.S. border, at a recreation center in Esteli, Nicaragua April 22, 2022. Picture taken April 22, 2022. REUTERS/Maynor Valenzuela 

Chief prison officer Conor Coen pets a horse held by groom instructor Paul Kelly during the opening of the "Horses for Hope" equine facility in Castlerea Prison to provide offenders with practical stable skills to secure employment in the equine industry post-release and also teaching compassion through the care of a living animal, in Castlerea, Ireland, April 20, 2022. REUTERS/Clodagh Kilcoyne 

Elena cries on the coffin of her son Vlad Liutov, 46, a martial arts instructor who joined the territorial defense and died during a rocket strike on the regional administration building on Tuesday, next to her grandson Andrei Liutov, 15, during the funeral, as Russia's invasion of Ukraine continues, in Mykolaiv, Ukraine April 1, 2022. REUTERS/Nacho Doce 

Elena salutes next to the coffin of Vlad Liutov, 46, and her grandson Andrei Liutov, 15, during her son's funeral, a martial arts instructor who joined the territorial defense and died during a rocket strike on the regional administration building on Tuesday, as Russia's invasion of Ukraine continues, in Mykolaiv, Ukraine April 1, 2022. REUTERS/Nacho Doce 

Elena kisses the portrait of her son Vlad Liutov, 46, next to her grandson Andrei Liutov, 15, during her son's funeral, a martial arts instructor who joined the territorial defense and died during a rocket strike on the regional administration building on Tuesday, as Russia's invasion of Ukraine continues, in Mykolaiv, Ukraine April 1, 2022. REUTERS/Nacho Doce 

Andrei Liutov,15, cries as he embraces the portrait of his father Vlad Liutov, 46, a martial arts instructor who joined the territorial defense and died during a rocket strike on the regional administration building on Tuesday, during the funeral, as Russia's invasion of Ukraine continues, in Mykolaiv, Ukraine April 1, 2022. REUTERS/Nacho Doce 

Elena kisses the portrait of Vlad Liutov, 46, next to her grandson Andrei Liutov, 15, during her son's funeral, a martial arts instructor who joined the territorial defense and died during a rocket strike on the regional administration building on Tuesday, as Russia's invasion of Ukraine continues, in Mykolaiv, Ukraine April 1, 2022. REUTERS/Nacho Doce 

Andrei Liutov,15, holds the combat knife of his father Vlad Liutov, 46, a martial arts instructor who joined the territorial defense and died during a rocket strike on the regional administration building on Tuesday, before the funeral, as Russia's invasion of Ukraine continues, in Mykolaiv, Ukraine April 1, 2022. REUTERS/Nacho Doce 

Comrades and friends of Vlad Liutov, 46; a martial arts instructor who joined the territorial defense and died during a rocket strike on the regional administration building on Tuesday, carry the coffin of him in front of his son Andrei Liutov,15, during the funeral, as Russia's invasion of Ukraine continues, in Mykolaiv, Ukraine April 1, 2022. REUTERS/Nacho Doce 

Elena, holds a picture of her son Vlad Liutov, 46; a martial arts instructor who joined the territorial defense and died during a rocket strike on the regional administration building on Tuesday, during his funeral, as Russia's invasion of Ukraine continues, in Mykolaiv, Ukraine April 1, 2022. REUTERS/Nacho Doce 

An instructor gives a weapons training to civilians, who volunteered to join the Territorial Defence Forces, in Drohobych, Lviv region, Ukraine, March 29, 2022. REUTERS/Viacheslav Ratynskyi 

An instructor checks targets as civilians, who volunteered to join the Territorial Defence Forces, receive a weapons training, in Lviv, Ukraine, March 28, 2022. REUTERS/Alkis Konstantinidis 

Civilians, who volunteered to join the Territorial Defence Forces, receive a weapons training by an instructor, in Lviv, Ukraine, March 28, 2022. REUTERS/Alkis Konstantinidis 

Civilians, who volunteered to join the Territorial Defence Forces, receive a weapons training by an instructor, in Lviv, Ukraine, March 28, 2022. REUTERS/Alkis Konstantinidis 

Instructors check targets as civilians, who volunteered to join the Territorial Defence Forces, receive a weapons training, in Lviv, Ukraine, March 28, 2022. REUTERS/Alkis Konstantinidis 

An instructor gives a weapons training to civilians who volunteered to join the Territorial Defence Forces in Lviv, Ukraine, March 28, 2022. REUTERS/Alkis Konstantinidis 

An instructor gives a weapons training to civilians who volunteered to join the Territorial Defence Forces in Lviv, Ukraine, March 28, 2022. REUTERS/Alkis Konstantinidis 

A man shoots at a target with a rifle, under the supervision of an instructor, during a practice session at a shooting range in Warsaw, Poland March 23, 2022. Picture taken March 23, 2022. REUTERS/Kuba Stezycki 

People take part in a practice session under the supervision of the instructors at a shooting range in Warsaw, Poland March 23, 2022. Picture taken March 23, 2022. REUTERS/Kuba Stezycki 

A shooting instructor explains how to aim a weapon, during practice session at a shooting range in Warsaw, Poland March 23, 2022. Picture taken March 23, 2022. REUTERS/Kuba Stezycki 

An instructor shows how to fire the weapon during a shooting training as Russia's attack on Ukraine continues, in Ivano-Frankivsk, Ukraine March 21, 2022. REUTERS/Yuriy Rylchuk 

An instructor shows how to handle the weapon during a shooting training as Russia's attack on Ukraine continues, in Ivano-Frankivsk, Ukraine March 21, 2022. REUTERS/Yuriy Rylchuk 

An instructor shows how to handle the weapon during a shooting training as Russia's attack on Ukraine continues, in Ivano-Frankivsk, Ukraine March 21, 2022. REUTERS/Yuriy Rylchuk 

People listen to the instructor as they attend a shooting training as Russia's attack on Ukraine continues, in Ivano-Frankivsk, Ukraine March 21, 2022. REUTERS/Yuriy Rylchuk 

People listen to the instructor as they attend a shooting training as Russia's attack on Ukraine continues, in Ivano-Frankivsk, Ukraine March 21, 2022. REUTERS/Yuriy Rylchuk 

An instructor teaches how to use a weapon to internet marketing workers Murager Sharipov, 26, his fiance, Mariia Pasternak, 25, and their mate, internet marketing sales manager, Maxim Yavtushenko, 32, who volunteered to join the Ukrainian Territorial Defence Forces, during a training session, as Russia's invasion of Ukraine continues, in Odessa, Ukraine, March 18, 2022. Picture taken March 18, 2022. REUTERS/Nacho Doce 

Internet marketing sales manager Maxim Yavtushenko, 32, and his girlfriend, graphic designer Olga Moroz, 26, who volunteered to join the Ukrainian Territorial Defence Forces, attend a medical emergencies training session with first aid instructor Roman Semchenko, 39, as Russia's invasion of Ukraine continues, in Odessa, Ukraine, March 18, 2022. Picture taken March 18, 2022. REUTERS/Nacho Doce 

An instructor conducts a military exercise for new members of the Territorial Defence Forces amid Russia's invasion of Ukraine, in Kyiv, Ukraine March 9, 2022. REUTERS/Valentyn Ogirenko 

An instructor shows a new member of the Territorial Defence Forces how to operate an NLAW anti-tank launcher during military exercises amid Russia's invasion of Ukraine, in Kyiv, Ukraine March 9, 2022. REUTERS/Valentyn Ogirenko 

An instructor shows new members of the Territorial Defence Forces how to operate an NLAW anti-tank launcher during military exercises amid Russia's invasion of Ukraine, in Kyiv, Ukraine March 9, 2022. REUTERS/Valentyn Ogirenko 

An instructor shows a new member of the Territorial Defence Forces how to operate NLAW anti tank launcher during military exercises amid Russia's invasion of Ukraine, in Kyiv, Ukraine March 9, 2022. REUTERS/Valentyn Ogirenko 

An instructor holds an AT4 anti-tank launcher during military exercises for new members of the Territorial Defence Forces amid Russia's invasion of Ukraine, in Kyiv, Ukraine March 9, 2022. REUTERS/Valentyn Ogirenko 

Instructors conduct military exercises for new members of the Territorial Defence Forces amid Russia's invasion of Ukraine, in Kyiv, Ukraine March 9, 2022. REUTERS/Valentyn Ogirenko 

An instructor shows new members of the Territorial Defence Forces how to operate the RPG-7 anti-tank launcher during military exercises amid Russia's invasion of Ukraine, in Kyiv, Ukraine March 9, 2022. REUTERS/Valentyn Ogirenko 

An instructor conducts a military exercise for new members of the Territorial Defence Forces amid Russia's invasion of Ukraine, in Kyiv, Ukraine March 9, 2022. REUTERS/Valentyn Ogirenko 

An instructor shows new members of the Territorial Defence Forces how to operate the NLAW anti-tank launcher during military exercises amid Russia's invasion of Ukraine, in Kyiv, Ukraine March 9, 2022. REUTERS/Valentyn Ogirenko