Crude prices have spiked about 60% since start of 2022

Troy, Michigan-based company’s stock has tumbled about 68%

Concerns over conflict weigh on S&P 500

Crude surged close to $120 in early hours

MSCI announced on Thursday that it had frozen the index

Surges past $100 as Moscow puts nuclear deterrent on high alert

Moody’s puts Moscow, Kyiv on review for downgrade

Takeover signals Future’s worsening financial situation

Move follows London's ban on the flights of Aeroflot

Conflict exacerbates concerns about disruptions to global energy supply