By Laura Sanicola and Arunima Kumar (Reuters) – Par Pacific Holdings Inc said on Thursday it would suspend the purchases of Russian crude oil for its Hawaii refinery, the first U.S. refiner to publicly refuse the country’s oil following a wave of sanctions imposed after Moscow’s invasion of Ukraine. The United States is open to imposing sanctions on Russia’s oil and gas flows but has stopped short of targeting Russia’s oil and gas exports as the Biden administration weighs the impacts on global oil markets and U.S. energy prices. After Russia’s invasion of Ukraine, the White House slapped sanc…