As Russia proceeds with a summer offensive on parts of the roughly 1,000-kilometer (620-mile) front line, U.S.-led peace efforts have failed to gain traction. Russian President Vladimir Putin has effectively rejected an offer from U.S. President Donald Trump for an immediate 30-day ceasefire, making it conditional on a halt on Ukraine’s mobilization effort and a freeze on Western arms supplies. สล็อต เว็บตรง