By Pavel Polityuk and Carlos Barria LVIV/IRPIN, Ukraine (Reuters) – Russia warned that oil prices could surge to $300 a barrel and it might close the main gas pipeline to Germany if the West halts oil imports over the invasion of Ukraine as peace talks on Monday made little progress. The incursion, the biggest attack on a European state since World War Two, has prompted 1.7 million people to flee, a raft of sanctions on Moscow, an exodus of foreign firms, and fears of wider conflict in the West unthought-of for decades. Sieges and the bombing of Ukrainian cities continued. A Russian strike on …