By Kanishka Singh and Humeyra Pamuk WASHINGTON (Reuters) – The parents of Trevor Reed, a former U.S. Marine jailed in Russia, said on Wednesday they were worried “something terrible” has happened to him and have not received any updates on his “rapidly declining health” in the past five days. Joe and Paula Reed, who met last week with U.S. President Joe Biden, said in a statement that a prisoner trade seemed to be the only way to bring Reed home in the short term. They urged the White House to take all possible steps to bring home their son. Tensions between Washington and Moscow are high in t…