Moscow’s advantage on the Ukraine battlefield is waning, experts say. But President Donald Trump seems disinclined to ramp up pressure on the Kremlin to engage in ceasefire talks.Russia’s battlefield strength in Ukraine has started to wane and it could run into serious shortages of manpower and weaponry by next year, even as President Donald Trump retreats from pressure on Moscow to end the war, according to senior U.S. and European officials and military experts. In recent days, Trump appears to have abandoned the threat of harsh financial sanctions he repeated as recently as two weeks ago if Moscow doesn’t agree...