俄媒：美参议员威胁俄方50天内达成和平协议，否则下场参考伊朗

Group 1 - The core viewpoint of the articles revolves around the ultimatum set by President Trump for Russia to reach a peace agreement with Ukraine within 50 days, with threats of severe tariffs and military support for Ukraine if not met [1][2][4] - Senator Lindsey Graham's comments suggest that failure to comply with the ultimatum could lead to consequences similar to those faced by Iran, indicating a potential escalation in U.S. rhetoric against Russia [2][3] - Trump's previous communications with Ukrainian President Zelensky included encouragement for Ukraine to strike deeper into Russian territory, raising concerns about the U.S. stance on military engagement [3][4] Group 2 - Russia's response to Trump's statements emphasized that any conditions or ultimatums are unacceptable, and they will continue their military operations if diplomatic efforts fail [4] - Russian officials expressed confusion over the U.S. threats of tariffs, highlighting that any agreements should be based on negotiations, which they claim Ukraine is currently absent from [4]