People walk along the Andreyevsky Bridge over the Moskva River during a sunny day in Moscow, Russia February 27, 2021. REUTERS/Shamil Zhumatov

People place flowers at the site of the assassination of Russian opposition politician Boris Nemtsov while marking the 6th anniversary of Nemtsov's death, in central Moscow, Russia February 27, 2021. REUTERS/Tatyana Makeyeva TPX IMAGES OF THE DAY

A view shows a non-operating smelting shop in the town of Nikel in Murmansk Region, Russia February 26, 2021. The smelter, which was the oldest production facility of Russian miner Norilsk Nickel, was closed in 2020 as part of the company's environmental programme aiming to reduce hazardous emissions into the atmosphere. REUTERS/Evgenia Novozhenina

A view shows the logo of Norilsk Nickel company at a non-operating smelting shop in the town of Nikel in Murmansk Region, Russia February 26, 2021. The smelter, which was the oldest production facility of Russian miner Norilsk Nickel, was closed in 2020 as part of the company's environmental programme aiming to reduce hazardous emissions into the atmosphere. REUTERS/Evgenia Novozhenina

A view shows a non-operating smelting shop in the town of Nikel in Murmansk Region, Russia February 26, 2021. The smelter, which was the oldest production facility of Russian miner Norilsk Nickel, was closed in 2020 as part of the company's environmental programme aiming to reduce hazardous emissions into the atmosphere. REUTERS/Evgenia Novozhenina

A view shows a non-operating smelting shop in the town of Nikel in Murmansk Region, Russia February 26, 2021. The smelter, which was the oldest production facility of Russian miner Norilsk Nickel, was closed as part of the company's environmental programme aiming to reduce hazardous emissions into the atmosphere. REUTERS/Evgenia Novozhenina

A view shows a non-operating smelting shop in the town of Nikel in Murmansk Region, Russia February 26, 2021. The smelter, which was the oldest production facility of Russian miner Norilsk Nickel, was closed as part of the company's environmental programme aiming to reduce hazardous emissions into the atmosphere. REUTERS/Evgenia Novozhenina

An interior view shows a non-operating smelting shop in the town of Nikel in Murmansk Region, Russia February 26, 2021. The smelter, which was the oldest production facility of Russian miner Norilsk Nickel, was closed as part of the company's environmental programme aiming to reduce hazardous emissions into the atmosphere. REUTERS/Evgenia Novozhenina

An employee shows a large gem-quality diamond named by Russian miner Alrosa after Sputnik-V, a vaccine against the coronavirus disease (COVID-19), in Moscow, Russia February 25, 2021. Picture taken February 25, 2021. REUTERS/Tatyana Makeyeva

An employee shows a large gem-quality diamond named by Russian miner Alrosa after Sputnik-V, a vaccine against the coronavirus disease (COVID-19), in Moscow, Russia February 25, 2021. Picture taken February 25, 2021. REUTERS/Tatyana Makeyeva

An employee shows a large gem-quality diamond named by Russian miner Alrosa after Sputnik-V, a vaccine against the coronavirus disease (COVID-19), in Moscow, Russia February 25, 2021. Picture taken February 25, 2021. REUTERS/Tatyana Makeyeva

A rare 242-carat rough diamond, which will be offered at the 100th international auction of Russian state-controlled diamond producer Alrosa, is placed on scales during a presentation in Moscow, Russia February 25, 2021. The diamond is one of the biggest gem-quality stones Alrosa has mined this century, the company said. Picture taken February 25, 2021. REUTERS/Tatyana Makeyeva

An employee shows gem-quality stones, including a rare 242-carat rough diamond that will be offered at the 100th international auction of Russian state-controlled diamond producer Alrosa, during a presentation in Moscow, Russia February 25, 2021. The diamond is one of the biggest gem-quality stones Alrosa has mined this century, the company said. Picture taken February 25, 2021. REUTERS/Tatyana Makeyeva TPX IMAGES OF THE DAY

A view shows gem-quality stones, including a rare 242-carat rough diamond that will be offered at the 100th international auction of Russian state-controlled diamond producer Alrosa, during a presentation in Moscow, Russia February 25, 2021. The diamond is one of the biggest gem-quality stones Alrosa has mined this century, the company said. Picture taken February 25, 2021. REUTERS/Tatyana Makeyeva

A view shows a rare 242-carat rough diamond, which will be offered at the 100th international auction of Russian state-controlled diamond producer Alrosa, during a presentation in Moscow, Russia February 25, 2021. The diamond is one of the biggest gem-quality stones Alrosa has mined this century, the company said. Picture taken February 25, 2021. REUTERS/Tatyana Makeyeva

An employee shows a rare 242-carat rough diamond, which will be offered at the 100th international auction of Russian state-controlled diamond producer Alrosa, during a presentation in Moscow, Russia February 25, 2021. The diamond is one of the biggest gem-quality stones Alrosa has mined this century, the company said. Picture taken February 25, 2021. REUTERS/Tatyana Makeyeva

A view shows gem-quality stones, including a rare 242-carat rough diamond that will be offered at the 100th international auction of Russian state-controlled diamond producer Alrosa, during a presentation in Moscow, Russia February 25, 2021. The diamond is one of the biggest gem-quality stones Alrosa has mined this century, the company said. Picture taken February 25, 2021. REUTERS/Tatyana Makeyeva

An employee shows a rare 242-carat rough diamond, which will be offered at the 100th international auction of Russian state-controlled diamond producer Alrosa, during a presentation in Moscow, Russia February 25, 2021. The diamond is one of the biggest gem-quality stones Alrosa has mined this century, the company said. Picture taken February 25, 2021. REUTERS/Tatyana Makeyeva

A view shows a city welcome sign in the town of Nikel in Murmansk Region, Russia February 26, 2021. REUTERS/Evgenia Novozhenina

A view shows a non-operating smelting shop behind residential buildings in the town of Nikel in Murmansk Region, Russia February 26, 2021. REUTERS/Evgenia Novozhenina

A view shows the town of Nikel in Murmansk Region, Russia February 26, 2021. REUTERS/Evgenia Novozhenina

A view shows the town of Nikel in Murmansk Region, Russia February 26, 2021. REUTERS/Evgenia Novozhenina

A view shows the town of Nikel in Murmansk Region, Russia February 26, 2021. REUTERS/Evgenia Novozhenina

A view shows a non-operating smelting shop the town of Nikel in Murmansk Region, Russia February 26, 2021. REUTERS/Evgenia Novozhenina

A view shows a church in the town of Nikel in Murmansk Region, Russia February 26, 2021. REUTERS/Evgenia Novozhenina TPX IMAGES OF THE DAY

A view shows the town of Nikel in Murmansk Region, Russia February 26, 2021. REUTERS/Evgenia Novozhenina

A view shows a city welcome sign in the town of Nikel in Murmansk Region, Russia February 26, 2021. REUTERS/Evgenia Novozhenina

An employee wears a safety helmet at a metallurgical workshop of Kola Mining and Metallurgical Company (Kola MMC), a subsidiary of Nornickel metals and mining company, in the town of Monchegorsk in Murmansk Region, Russia February 25, 2021. REUTERS/Evgenia Novozhenina

An employee works in a copper electrolysis workshop of Kola Mining and Metallurgical Company (Kola MMC), a subsidiary of Nornickel metals and mining company, in the town of Monchegorsk in Murmansk Region, Russia February 25, 2021. REUTERS/Evgenia Novozhenina

A vehicle drives along a snow-covered road near the production facilities of Kola Mining and Metallurgical Company (Kola MMC), a subsidiary of Nornickel metals and mining company, in the town of Monchegorsk in Murmansk Region, Russia February 25, 2021. REUTERS/Evgenia Novozhenina

Cars drive near the production facilities of Kola Mining and Metallurgical Company (Kola MMC), a subsidiary of Nornickel metals and mining company, in the town of Monchegorsk in Murmansk Region, Russia February 25, 2021. REUTERS/Evgenia Novozhenina

A general view shows the production facilities of Kola Mining and Metallurgical Company (Kola MMC), a subsidiary of Nornickel metals and mining company, in the town of Monchegorsk in Murmansk Region, Russia February 25, 2021. REUTERS/Evgenia Novozhenina

A view shows a logo near the production facilities the production facilities of Kola Mining and Metallurgical Company (Kola MMC), a subsidiary of Nornickel metals and mining company, in the town of Monchegorsk in Murmansk Region, Russia February 25, 2021. REUTERS/Evgenia Novozhenina

A general view shows the production facilities of Kola Mining and Metallurgical Company (Kola MMC), a subsidiary of Nornickel metals and mining company, in the town of Monchegorsk in Murmansk Region, Russia February 25, 2021. REUTERS/Evgenia Novozhenina

A general view shows the production facilities of Kola Mining and Metallurgical Company (Kola MMC), a subsidiary of Nornickel metals and mining company, in the town of Monchegorsk in Murmansk Region, Russia February 25, 2021. REUTERS/Evgenia Novozhenina

An employee works in a nickel electrolysis workshop of Kola Mining and Metallurgical Company (Kola MMC), a subsidiary of Nornickel metals and mining company, in the town of Monchegorsk in Murmansk Region, Russia February 25, 2021. REUTERS/Evgenia Novozhenina

An employee works in a nickel electrolysis workshop of Kola Mining and Metallurgical Company (Kola MMC), a subsidiary of Nornickel metals and mining company, in the town of Monchegorsk in Murmansk Region, Russia February 25, 2021. REUTERS/Evgenia Novozhenina

A view shows nickel sheets at Kola Mining and Metallurgical Company (Kola MMC), a subsidiary of Nornickel metals and mining company, in the town of Monchegorsk in Murmansk Region, Russia February 25, 2021. REUTERS/Evgenia Novozhenina

A view shows nickel sheets at Kola Mining and Metallurgical Company (Kola MMC), a subsidiary of Nornickel metals and mining company, in the town of Monchegorsk in Murmansk Region, Russia February 25, 2021. REUTERS/Evgenia Novozhenina

An employee works in a nickel electrolysis workshop of Kola Mining and Metallurgical Company (Kola MMC), a subsidiary of Nornickel metals and mining company, in the town of Monchegorsk in Murmansk Region, Russia February 25, 2021. REUTERS/Evgenia Novozhenina

A view shows nickel sheets at Kola Mining and Metallurgical Company (Kola MMC), a subsidiary of Nornickel metals and mining company, in the town of Monchegorsk in Murmansk Region, Russia February 25, 2021. REUTERS/Evgenia Novozhenina

An employee works in a workshop of Kola Mining and Metallurgical Company (Kola MMC), a subsidiary of Nornickel metals and mining company, in the town of Monchegorsk in Murmansk Region, Russia February 25, 2021. REUTERS/Evgenia Novozhenina

An employee works in a copper electrolysis workshop of Kola Mining and Metallurgical Company (Kola MMC), a subsidiary of Nornickel metals and mining company, in the town of Monchegorsk in Murmansk Region, Russia February 25, 2021. REUTERS/Evgenia Novozhenina

Employees work in a copper electrolysis workshop of Kola Mining and Metallurgical Company (Kola MMC), a subsidiary of Nornickel metals and mining company, in the town of Monchegorsk in Murmansk Region, Russia February 25, 2021. REUTERS/Evgenia Novozhenina

A view shows a metallurgical workshop of Kola Mining and Metallurgical Company (Kola MMC), a subsidiary of Nornickel metals and mining company, in the town of Monchegorsk in Murmansk Region, Russia February 25, 2021. REUTERS/Evgenia Novozhenina

A view shows a metallurgical workshop of Kola Mining and Metallurgical Company (Kola MMC), a subsidiary of Nornickel metals and mining company, in the town of Monchegorsk in Murmansk Region, Russia February 25, 2021. REUTERS/Evgenia Novozhenina

A view shows a metallurgical workshop of Kola Mining and Metallurgical Company (Kola MMC), a subsidiary of Nornickel metals and mining company, in the town of Monchegorsk in Murmansk Region, Russia February 25, 2021. REUTERS/Evgenia Novozhenina

A view shows a metallurgical workshop of Kola Mining and Metallurgical Company (Kola MMC), a subsidiary of Nornickel metals and mining company, in the town of Monchegorsk in Murmansk Region, Russia February 25, 2021. REUTERS/Evgenia Novozhenina

Antonina Efimova, a homeless woman aged 54, who was found while sleeping in the metro, walks out of a bus of the Social Patrol service upon the arrival at the Elizaveta Glinka Centre for Social Adaptation in Moscow, Russia February 24, 2021. Picture taken February 24, 2021. REUTERS/Shamil Zhumatov

Members of the Social Patrol service accompany Antonina Efimova, a homeless woman aged 54, who was found while sleeping in the metro, in Moscow, Russia February 24, 2021. Picture taken February 24, 2021. REUTERS/Shamil Zhumatov

Elena Bykova, member of the Social Patrol service, accompanies Antonina Efimova, a homeless woman aged 54, who was found while sleeping in the metro, in Moscow, Russia February 24, 2021. Picture taken February 24, 2021. REUTERS/Shamil Zhumatov

A police officer takes a note while standing next to Antonina Efimova, a homeless woman aged 54, who sleeps in a underground pass in Moscow, Russia February 24, 2021. Picture taken February 24, 2021. REUTERS/Shamil Zhumatov

Low-income people in wheelchairs are seen near the Elizaveta Glinka Centre for Social Adaptation on a snowy day in Moscow, Russia February 24, 2021. Picture taken February 24, 2021. REUTERS/Shamil Zhumatov

Low-income people in wheelchairs are seen near the Elizaveta Glinka Centre for Social Adaptation on a snowy day in Moscow, Russia February 24, 2021. Picture taken February 24, 2021. REUTERS/Shamil Zhumatov

A visitor wears a protective face mask in the Rescue Shelter, which was opened by the Orthodox charity organisation Miloserdie to provide services to the homeless, in Moscow, Russia February 16, 2021. Picture taken February 16, 2021. REUTERS/Evgenia Novozhenina

People queue before receiving their meals in the Rescue Shelter, which was opened by the Orthodox charity organisation Miloserdie to provide services to the homeless, in Moscow, Russia February 16, 2021. Picture taken February 16, 2021. REUTERS/Evgenia Novozhenina

People queue before receiving their meals in the Rescue Shelter, which was opened by the Orthodox charity organisation Miloserdie to provide services to the homeless, in Moscow, Russia February 16, 2021. Picture taken February 16, 2021. REUTERS/Evgenia Novozhenina

People visit the Rescue Shelter, which was opened by the Orthodox charity organisation Miloserdie to provide services to the homeless, in Moscow, Russia February 16, 2021. Picture taken February 16, 2021. REUTERS/Evgenia Novozhenina

People visit the Rescue Shelter, which was opened by the Orthodox charity organisation Miloserdie to provide services to the homeless, in Moscow, Russia February 16, 2021. Picture taken February 16, 2021. REUTERS/Evgenia Novozhenina

People gather in the Rescue Shelter, which was opened by the Orthodox charity organisation Miloserdie to provide services to the homeless, in Moscow, Russia February 16, 2021. Picture taken February 16, 2021. REUTERS/Evgenia Novozhenina