West Texas Intermediate (WTI) crude oil prices were up 2.5% in Monday trading at 2:42 p.m. ET, reaching $58.17, as tensions flared in Yemen and hopes for a peace deal on the Russia-Ukraine front dissipated following unsuccessful talks between Kyiv and Washington. In Yemen, the Saudi-led coalition has vowed to retaliate against any military moves by the main southern separatist group backed by the UAE, the Saudi state news agency reported on Saturday. Last week, an escalation of fighting killed two people from the separatist group. Meanwhile,…