ANKARA, July 8 (Reuters) - U.S. President Donald Trump warned Iran that the United States will likely engage in additional strikes on Wednesday night after attacks the previous day. "I'll give a little warning: We're going to hit them hard tonight," Trump told reporters at the NATO summit in Turkey before his meeting with Ukrainian President Volodymyr Zelenskiy. In earlier comments to reporters in Ankara, Trump said a memorandum of understanding that served as an initial ceasefire deal between t