An Ilyushin Il-76 transport plane carrying Russian paratroopers takes off during drills at a military aerodrome in the Azov Sea port of Taganrog, Russia April 22, 2021. REUTERS/Stringer

An aerial view shows a military aerodrome during drills of Russian airborne forces in the Azov Sea port of Taganrog, Russia April 22, 2021. Picture taken with a drone. REUTERS/Stringer

Service members of the Russian airborne forces sit in an Ilyushin Il-76 transport plane before their departure as they take part in drills at a military aerodrome in the Azov Sea port of Taganrog, Russia April 22, 2021. REUTERS/Stringer

Service members of the Russian airborne forces board an Ilyushin Il-76 transport plane during drills at a military aerodrome in the Azov Sea port of Taganrog, Russia April 22, 2021. REUTERS/Stringer

Service members of the Russian airborne forces board Ilyushin Il-76 transport planes during drills at a military aerodrome in the Azov Sea port of Taganrog, Russia April 22, 2021. REUTERS/Stringer

Service members of the Russian airborne forces walk before boarding Ilyushin Il-76 transport planes during drills at a military aerodrome in the Azov Sea port of Taganrog, Russia April 22, 2021. REUTERS/Stringer

Service members of the Russian airborne forces board Ilyushin Il-76 transport planes during drills at a military aerodrome in the Azov Sea port of Taganrog, Russia April 22, 2021. Picture taken with a drone. REUTERS/Stringer

Service members of the Russian airborne forces wait before boarding Ilyushin Il-76 transport planes during drills at a military aerodrome in the Azov Sea port of Taganrog, Russia April 22, 2021. REUTERS/Stringer

Service members of the Russian airborne forces wait before boarding Ilyushin Il-76 transport planes during drills at a military aerodrome in the Azov Sea port of Taganrog, Russia April 22, 2021. REUTERS/Stringer

Service members of the Russian airborne forces line up before boarding Ilyushin Il-76 transport planes during drills at a military aerodrome in the Azov Sea port of Taganrog, Russia April 22, 2021. Picture taken with a drone. REUTERS/Stringer

Service members of the Russian airborne forces wait before boarding Ilyushin Il-76 transport planes during drills at a military aerodrome in the Azov Sea port of Taganrog, Russia April 22, 2021. REUTERS/Stringer

Service members of the Russian airborne forces get wait before boarding Ilyushin Il-76 transport planes during drills at a military aerodrome in the Azov Sea port of Taganrog, Russia April 22, 2021. REUTERS/Stringer

Service members of the Russian airborne forces get prepared before boarding Ilyushin Il-76 transport planes during drills at a military aerodrome in the Azov Sea port of Taganrog, Russia April 22, 2021. REUTERS/Stringer

A service member of the Russian airborne forces gets prepared before boarding an Ilyushin Il-76 transport plane during drills at a military aerodrome in the Azov Sea port of Taganrog, Russia April 22, 2021. REUTERS/Stringer

Service members of the Russian airborne forces get prepared before boarding Ilyushin Il-76 transport planes during drills at a military aerodrome in the Azov Sea port of Taganrog, Russia April 22, 2021. REUTERS/Stringer

Service members of the Russian airborne forces line up before boarding Ilyushin Il-76 transport planes during drills at a military aerodrome in the Azov Sea port of Taganrog, Russia April 22, 2021. Picture taken with a drone. REUTERS/Stringer TPX IMAGES OF THE DAY

Service members of the Russian airborne forces line up before boarding Ilyushin Il-76 transport planes during drills at a military aerodrome in the Azov Sea port of Taganrog, Russia April 22, 2021. Picture taken with a drone. REUTERS/Stringer

Service members of the Russian airborne forces get prepared before boarding Ilyushin Il-76 transport planes during drills at a military aerodrome in the Azov Sea port of Taganrog, Russia April 22, 2021. REUTERS/Stringer

Service members of the Russian airborne forces wait before boarding Ilyushin Il-76 transport planes during drills at a military aerodrome in the Azov Sea port of Taganrog, Russia April 22, 2021. REUTERS/Stringer

Service members of the Russian airborne forces wait before boarding Ilyushin Il-76 transport planes during drills at a military aerodrome in the Azov Sea port of Taganrog, Russia April 22, 2021. REUTERS/Stringer

Service members of the Russian airborne forces line up before boarding Ilyushin Il-76 transport planes during drills at a military aerodrome in the Azov Sea port of Taganrog, Russia April 22, 2021. Picture taken with a drone. REUTERS/Stringer

Service members of the Russian airborne forces line up before boarding Ilyushin Il-76 transport planes during drills at a military aerodrome in the Azov Sea port of Taganrog, Russia April 22, 2021. Picture taken with a drone. REUTERS/Stringer

Britain's Prime Minister Boris Johnson is shown around the Team Tempest facility during a visit to BAE Systems at Warton Aerodrome near Preston, Britain March 22, 2021. Christopher Furlong/Pool via REUTERS

Britain's Prime Minister Boris Johnson is shown around the Team Tempest facility during a visit to BAE Systems at Warton Aerodrome near Preston, Britain March 22, 2021. Christopher Furlong/Pool via REUTERS

Britain's Prime Minister Boris Johnson is shown around the Team Tempest facility during a visit to BAE Systems at Warton Aerodrome near Preston, Britain March 22, 2021. Christopher Furlong/Pool via REUTERS

Britain's Prime Minister Boris Johnson is shown around the Team Tempest facility during a visit to BAE Systems at Warton Aerodrome near Preston, Britain March 22, 2021. Christopher Furlong/Pool via REUTERS

Britain's Prime Minister Boris Johnson is shown around the Team Tempest facility during a visit to BAE Systems at Warton Aerodrome near Preston, Britain March 22, 2021. Christopher Furlong/Pool via REUTERS

Britain's Prime Minister Boris Johnson meets employees during a visit to BAE Systems facility at Warton Aerodrome near Preston, Britain March 22, 2021. Christopher Furlong/Pool via REUTERS

Britain's Prime Minister Boris Johnson meets employees during a visit to BAE Systems facility at Warton Aerodrome near Preston, Britain March 22, 2021. Christopher Furlong/Pool via REUTERS

Britain's Prime Minister Boris Johnson meets an employee during a visit to BAE Systems facility at Warton Aerodrome near Preston, Britain March 22, 2021. Christopher Furlong/Pool via REUTERS

Britain's Prime Minister Boris Johnson meets employees during a visit to BAE Systems facility at Warton Aerodrome near Preston, Britain March 22, 2021. Christopher Furlong/Pool via REUTERS

Britain's Prime Minister Boris Johnson drinks from a mug during a visit to BAE Systems facility at Warton Aerodrome near Preston, Britain March 22, 2021. Christopher Furlong/Pool via REUTERS

Britain's Prime Minister Boris Johnson sanitizes his hands during a visit to BAE Systems facility at Warton Aerodrome near Preston, Britain March 22, 2021. Christopher Furlong/Pool via REUTERS

Britain's Prime Minister Boris Johnson tries out a power tool during a visit to BAE Systems facility at Warton Aerodrome near Preston, Britain March 22, 2021. Christopher Furlong/Pool via REUTERS

Britain's Prime Minister Boris Johnson meets an employee during a visit to BAE Systems facility at Warton Aerodrome near Preston, Britain March 22, 2021. Christopher Furlong/Pool via REUTERS

Britain's Prime Minister Boris Johnson tries out a power tool during a visit to BAE Systems facility at Warton Aerodrome near Preston, Britain March 22, 2021. Christopher Furlong/Pool via REUTERS

Britain's Prime Minister Boris Johnson tries out a power tool during a visit to BAE Systems facility at Warton Aerodrome near Preston, Britain March 22, 2021. Christopher Furlong/Pool via REUTERS

Britain's Prime Minister Boris Johnson meets an employee during a visit to BAE Systems facility at Warton Aerodrome near Preston, Britain March 22, 2021. Christopher Furlong/Pool via REUTERS

Britain's Prime Minister Boris Johnson meets young employees during a visit to BAE Systems facility at Warton Aerodrome near Preston, Britain March 22, 2021. Christopher Furlong/Pool via REUTERS

Britain's Prime Minister Boris Johnson meets an employee during a visit to BAE Systems facility at Warton Aerodrome near Preston, Britain March 22, 2021. Christopher Furlong/Pool via REUTERS

Britain's Prime Minister Boris Johnson meets an employee during a visit to BAE Systems facility at Warton Aerodrome near Preston, Britain March 22, 2021. Christopher Furlong/Pool via REUTERS

Britain's Prime Minister Boris Johnson meets an employee during a visit to BAE Systems facility at Warton Aerodrome near Preston, Britain March 22, 2021. Christopher Furlong/Pool via REUTERS

Britain's Prime Minister Boris Johnson wears a protective mask during a visit to BAE Systems facility at Warton Aerodrome near Preston, Britain March 22, 2021. Christopher Furlong/Pool via REUTERS

Britain's Prime Minister Boris Johnson tries out a power tool during a visit to BAE Systems facility at Warton Aerodrome near Preston, Britain March 22, 2021. Christopher Furlong/Pool via REUTERS

Britain's Prime Minister Boris Johnson wears a protective mask during a visit to BAE Systems facility at Warton Aerodrome near Preston, Britain March 22, 2021. Christopher Furlong/Pool via REUTERS

Britain's Prime Minister Boris Johnson talks during a visit to BAE Systems facility at Warton Aerodrome near Preston, Britain March 22, 2021. Christopher Furlong/Pool via REUTERS

The entrance of an aerodrome gun tower is surrounded by wild flowers and grass in Kaohsiung, Taiwan, January 1, 2020. REUTERS/Ann Wang SEARCH "TAIWAN BUNKER" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

French inventor Franky Zapata lands on a Flyboard during a demonstration as he prepares to cross the English channel from Sangatte in France to Dover, at the Saint-Inglevert aerodrome near Calais, France, July 24, 2019. REUTERS/Pascal Rossignol

French inventor Franky Zapata is seen on a Flyboard next to his wife after landing during a demonstration as he prepares to cross the English channel from Sangatte in France to Dover, at the Saint-Inglevert aerodrome near Calais, France, July 24, 2019. REUTERS/Pascal Rossignol

French inventor Franky Zapata on a Flyboard is helped by his wife to install a fuel supply bag on his back during a demonstration as he prepares to cross the English channel from Sangatte in France to Dover, at the Saint-Inglevert aerodrome near Calais, France, July 24, 2019. REUTERS/Pascal Rossignol

French inventor Franky Zapata flies on a Flyboard during a demonstration as he prepares to cross the English channel from Sangatte in France to Dover, at the Saint-Inglevert aerodrome near Calais, France, July 24, 2019. REUTERS/Pascal Rossignol TPX IMAGES OF THE DAY

French inventor Franky Zapata flies on a Flyboard during a demonstration as he prepares to cross the English channel from Sangatte in France to Dover, at the Saint-Inglevert aerodrome near Calais, France, July 24, 2019. REUTERS/Pascal Rossignol

French inventor Franky Zapata poses with a a Flyboard during a news conference as he prepares to cross the English channel from Sangatte in France to Dover, at the Saint-Inglevert aerodrome near Calais, France, July 24, 2019. REUTERS/Pascal Rossignol

French inventor Franky Zapata is seen with a Flyboard before a demonstration as he prepares to cross the English channel from Sangatte in France to Dover, at the Saint-Inglevert aerodrome near Calais, France, July 24, 2019. REUTERS/Pascal Rossignol

French inventor Franky Zapata flies on a Flyboard during a demonstration as he prepares to cross the English channel from Sangatte in France to Dover, at the Saint-Inglevert aerodrome near Calais, France, July 24, 2019. REUTERS/Pascal Rossignol

French inventor Franky Zapata checks a Flyboard before a demonstration as he prepares to cross the English channel from Sangatte in France to Dover, at the Saint-Inglevert aerodrome near Calais, France, July 24, 2019. REUTERS/Pascal Rossignol

French inventor Franky Zapata is seen with a Flyboard during a demonstration as he prepares to cross the English channel from Sangatte in France to Dover, at the Saint-Inglevert aerodrome near Calais, France, July 24, 2019. REUTERS/Pascal Rossignol

French inventor Franky Zapata attends a news conference with his wife and his son after a demonstration as he prepares to cross the English channel from Sangatte in France to Dover, at the Saint-Inglevert aerodrome near Calais, France, July 24, 2019. REUTERS/Pascal Rossignol

French inventor Franky Zapata flies on a Flyboard during a demonstration as he prepares to cross the English channel from Sangatte in France to Dover, at the Saint-Inglevert aerodrome near Calais, France, July 24, 2019. REUTERS/Pascal Rossignol

French inventor Franky Zapata flies on a Flyboard during a demonstration as he prepares to cross the English channel from Sangatte in France to Dover, at the Saint-Inglevert aerodrome near Calais, France, July 24, 2019. REUTERS/Pascal Rossignol