Gold prices tumbled below the $4,000-per-ounce mark on Friday, and crude prices fell as Russia escalated strikes on Ukraine’s energy grid, heightening geopolitical tensions.Russia Attacks Ukraine’s Energy InfrastructureThe pullback comes amid fresh reports of a “massive” Russian assault on Ukraine’s power infrastructure, according to CNN. Ukrainian officials described the early Friday barrage as targeting energy generation and distribution facilities, a tactic reminiscent of previous winter campaigns aimed ...