A person jogs past dead seals washed up on the coast of the Caspian Sea in Makhachkala, Russia, December 6, 2022. REUTERS/Kazbek Basayev TPX IMAGES OF THE DAY 

A view shows dead seals washed up on the coast of the Caspian Sea in Makhachkala, Russia, December 6, 2022. REUTERS/Kazbek Basayev 

A view shows a dead seal washed up on the coast of the Caspian Sea in Makhachkala, Russia, December 6, 2022. REUTERS/Kazbek Basayev 

A view shows dead seals washed up on the coast of the Caspian Sea in Makhachkala, Russia, December 6, 2022. REUTERS/Kazbek Basayev 

A view shows dead seals washed up on the coast of the Caspian Sea in Makhachkala, Russia, December 6, 2022. REUTERS/Kazbek Basayev 

A view shows a dead seal on the shore of the Caspian Sea outside Makhachkala, Russia, December 4, 2022. REUTERS/Victoria Kubayeva 

A view shows a dead seal on the shore of the Caspian Sea outside Makhachkala, Russia, December 4, 2022. REUTERS/Victoria Kubayeva 

A worker walks past infrastructure on D Island, the main processing hub, at the Kashagan offshore oil field in the Caspian sea in western Kazakhstan August 21, 2013. REUTERS/Stringer 

A general view shows an embankment of the Caspian Sea in Baku, Azerbaijan June 14, 2021. Picture taken through the window. REUTERS/Valentyn Ogirenko 

A general view shows a ferry wheel on an embankment of the Caspian Sea in Baku, Azerbaijan June 14, 2021. REUTERS/Valentyn Ogirenko 

A Shmel-class gunboat of the Russian Navy's Caspian Flotilla sails past a cruise ship on the Don River during the inter-fleet move from the Caspian Sea to the Black Sea, in Rostov-on-Don, Russia April 13, 2021. REUTERS/Sergey Pivovarov 

Landing crafts of the Russian Navy's Caspian Flotilla sail past a cruise ship on the Don River during the inter-fleet move from the Caspian Sea to the Black Sea, in Rostov-on-Don, Russia April 13, 2021. REUTERS/Sergey Pivovarov 

Fishermen are seen on the bank of the Don River as a Shmel-class gunboat of the Russian Navy's Caspian Flotilla sails past a cruise ship during the inter-fleet move from the Caspian Sea to the Black Sea, in Rostov-on-Don, Russia April 13, 2021. REUTERS/Sergey Pivovarov 

A Shmel-class gunboat of the Russian Navy's Caspian Flotilla sails along the Don River during the inter-fleet move from the Caspian Sea to the Black Sea, in Rostov-on-Don, Russia April 13, 2021. REUTERS/Sergey Pivovarov 

A tug boat and landing crafts of the Russian Navy's Caspian Flotilla are pictured on the Don River during the inter-fleet move from the Caspian Sea to the Black Sea, on the outskirts of Rostov-on-Don, Russia April 12, 2021. REUTERS/Sergey Pivovarov TPX IMAGES OF THE DAY 

Landing crafts of the Russian Navy's Caspian Flotilla are pictured on the Don River during the inter-fleet move from the Caspian Sea to the Black Sea, on the outskirts of Rostov-on-Don, Russia April 12, 2021. REUTERS/Sergey Pivovarov 

A view shows a Lun-class Soviet-made ekranoplan, which is a naval craft and a ground-effect vehicle, on the Caspian Sea coastline in Derbent in the Republic of Dagestan, Russia November 3, 2020. Picture taken November 3, 2020. REUTERS/Kazbek Basayev 

A view shows a Lun-class Soviet-made ekranoplan, which is a naval craft and a ground-effect vehicle, on the Caspian Sea coastline in Derbent in the Republic of Dagestan, Russia November 3, 2020. Picture taken November 3, 2020. REUTERS/Kazbek Basayev 

A view shows a Lun-class Soviet-made ekranoplan, which is a naval craft and a ground-effect vehicle, on the Caspian Sea coastline in Derbent in the Republic of Dagestan, Russia November 4, 2020. Picture taken November 4, 2020. REUTERS/Kazbek Basayev 

A view shows a Lun-class Soviet-made ekranoplan, which is a naval craft and a ground-effect vehicle, on the Caspian Sea coastline in Derbent in the Republic of Dagestan, Russia November 4, 2020. Picture taken November 4, 2020. REUTERS/Kazbek Basayev 

Russian Mi-35 attack helicopters fire during the military exercises known as "Centre-2019" at the range Turali on the Caspian Sea coast in the Republic of Dagestan, Russia September 20, 2019. REUTERS/Sergey Pivovarov 

A Russian Mi-8 helicopter is seen during the military exercises known as "Centre-2019" at the range Turali on the Caspian Sea coast in the Republic of Dagestan, Russia September 20, 2019. REUTERS/Sergey Pivovarov 

Russian Mi-35 and Mi-24 attack helicopters fly during the military exercises known as "Centre-2019" at the range Turali on the Caspian Sea coast in the Republic of Dagestan, Russia September 20, 2019. REUTERS/Sergey Pivovarov 

Russian marines go ashore near a BTR-82A armoured personnel carrier during the military exercises known as "Centre-2019" at the range Turali on the Caspian Sea coast in the Republic of Dagestan, Russia September 20, 2019. REUTERS/Sergey Pivovarov 

Russian marines disembark from a Mi-8 helicopter during the military exercises known as "Centre-2019" at the range Turali on the Caspian Sea coast in the Republic of Dagestan, Russia September 20, 2019. REUTERS/Sergey Pivovarov 

A Russian BTR-82A armoured personnel carrier drives onto the shore during the military exercises known as "Centre-2019" at the range Turali on the Caspian Sea coast in the Republic of Dagestan, Russia September 20, 2019. REUTERS/Sergey Pivovarov 

Russian servicemen go ashore during the military exercises known as "Centre-2019" at the range Turali on the Caspian Sea coast in the Republic of Dagestan, Russia September 20, 2019. REUTERS/Sergey Pivovarov 

Russian Mi-35 attack helicopters fire during the military exercises known as "Centre-2019" at the range Turali on the Caspian Sea coast in the Republic of Dagestan, Russia September 20, 2019. REUTERS/Sergey Pivovarov 

An aerial view of the Caspian Sea near the city of Baku is pictured through the window of Turkish Airlines airplane, ahead of Europa League Final, in Baku Azerbaijan May 27, 2019. REUTERS/Amr Abdallah Dalsh 

An aerial view of the Caspian Sea near the city of Baku is pictured through the window of Turkish Airlines airplane, ahead of Europa League Final, in Baku Azerbaijan May 27, 2019. REUTERS/Amr Abdallah Dalsh 

An aerial view of the Caspian Sea near the city of Baku is pictured through the window of Turkish Airlines airplane, ahead of Europa League Final, in Baku Azerbaijan May 27, 2019. REUTERS/Amr Abdallah Dalsh 

An aerial view of the Caspian Sea near the city of Baku is pictured through the window of Turkish Airlines airplane, ahead of Europa League Final, in Baku Azerbaijan May 27, 2019. REUTERS/Amr Abdallah Dalsh 

An aerial view of the Caspian Sea near the city of Baku is pictured through the window of Turkish Airlines airplane, ahead of Europa League Final, in Baku Azerbaijan May 27, 2019. REUTERS/Amr Abdallah Dalsh 

Oil platforms operated by Lukoil company are seen at the Korchagina oil field in Caspian Sea, Russia October 17, 2018. Picture taken October 17, 2018. REUTERS/Maxim Shemetov 

An oil platform operated by Lukoil company is seen at the Korchagina oil field in Caspian Sea, Russia October 17, 2018. Picture taken October 17, 2018. REUTERS/Maxim Shemetov 

A helicopter arrives to the Filanovskogo oil platform operated by Lukoil company in Caspian Sea, Russia October 16, 2018. Picture taken October 16, 2018. REUTERS/Maxim Shemetov 

An oil platform operated by Lukoil company is seen at the Filanovskogo oil field in Caspian Sea, Russia October 16, 2018. Picture taken October 16, 2018. REUTERS/Maxim Shemetov 

Platforms operated by Lukoil company are seen at the Filanovskogo oil field in Caspian Sea, Russia October 16, 2018. Picture taken October 16, 2018. REUTERS/Maxim Shemetov 

An oil platform operated by Lukoil company is seen at the Korchagina oil field in Caspian Sea, Russia October 17, 2018. Picture taken October 17, 2018. REUTERS/Maxim Shemetov 

A manometer and sign are seen at the Korchagina oil platform operated by Lukoil company in Caspian Sea, Russia October 17, 2018. Sign reads "Oil". Picture taken October 17, 2018. REUTERS/Maxim Shemetov 

A gas torch is seen at the Filanovskogo oil platform operated by Lukoil company in Caspian Sea, Russia October 16, 2018. Picture taken October 16, 2018. REUTERS/Maxim Shemetov 

A gas torch is seen next to the Lukoil company sign at the Filanovskogo oil platform in the Caspian Sea, Russia October 16, 2018. Picture taken October 16, 2018. REUTERS/Maxim Shemetov 

A gas torch is seen next to the Lukoil company sign at the Filanovskogo oil platform in the Caspian Sea, Russia October 16, 2018. Picture taken October 16, 2018. REUTERS/Maxim Shemetov 

Specialists work at the operations room of Filanovskogo oil platform operated by Lukoil company in Caspian Sea, Russia October 16, 2018. Picture taken October 16, 2018. REUTERS/Maxim Shemetov 

An oil platform operated by Lukoil company is seen at the Filanovskogo oil field in Caspian Sea, Russia October 16, 2018. Picture taken October 16, 2018. REUTERS/Maxim Shemetov 

A supply vessel is seen near the Korchagina oil platform operated by Lukoil company in Caspian Sea, Russia October 17, 2018. Picture taken October 17, 2018. REUTERS/Maxim Shemetov 

A specialist inspects valves at the Korchagina oil platform operated by Lukoil company in Caspian Sea, Russia October 17, 2018. Picture taken October 17, 2018. REUTERS/Maxim Shemetov 

A specialist looks at the torch on Korchagina oil platform operated by Lukoil company in the Caspian Sea, Russia October 17, 2018. Picture taken October 17, 2018. REUTERS/Maxim Shemetov 

A sign and a manometer are seen at the Korchagina oil platform operated by Lukoil company in Caspian Sea, Russia October 17, 2018. Sign reads "Oil". Picture taken October 17, 2018. REUTERS/Maxim Shemetov 

Specialists work at the Korchagina oil platform operated by Lukoil company in Caspian Sea, Russia October 17, 2018. Picture taken October 17, 2018. REUTERS/Maxim Shemetov 

An employee holds a sample of oil at the Filanovskogo platform operated by Lukoil company in Caspian Sea, Russia October 16, 2018. Picture taken October 16, 2018. REUTERS/Maxim Shemetov 

A seagull flies past torch at the Filanovskogo platform operated by Lukoil company in Caspian Sea, Russia October 16, 2018. Picture taken October 16, 2018. REUTERS/Maxim Shemetov 

A birds fly past oil platform operated by Lukoil company at the Filanovskogo oil field in Caspian Sea, Russia October 16, 2018. Picture taken October 16, 2018. REUTERS/Maxim Shemetov 

An employee takes a sample of oil at the Filanovskogo platform operated by Lukoil company in Caspian Sea, Russia October 16, 2018. Picture taken October 16, 2018. REUTERS/Maxim Shemetov 

Lukoil company logo is pictured on a helmet at the Filanovskogo platform in Caspian Sea, Russia October 16, 2018. Picture taken October 16, 2018. REUTERS/Maxim Shemetov 

An employee takes a sample of oil at the Filanovskogo platform operated by Lukoil company in Caspian Sea, Russia October 16, 2018. Picture taken October 16, 2018. REUTERS/Maxim Shemetov 

A lake and hills are seen from a plane near the city of Aktau, located near the Caspian Sea in Kazakhstan, July 8, 2018. As well as shooting all the matches, Reuters photographers are producing pictures showing their own quirky view from the sidelines of the World Cup. REUTERS/David Gray 

People attend an opening ceremony of the cargo and passenger seaport in the Caspian sea town of Turkmenbashi, Turkmenistan May 2, 2018. REUTERS/Marat Gurt 

People attend an opening ceremony of the cargo and passenger seaport in the Caspian sea town of Turkmenbashi, Turkmenistan May 2, 2018. REUTERS/Marat Gurt 

People attend an opening ceremony of the cargo and passenger seaport in the Caspian sea town of Turkmenbashi, Turkmenistan May 2, 2018. REUTERS/Marat Gurt