Because he can't win
Biden is under serious pressure within the party. The American president is forced to drop out of the election race next weekend. The White House claims that Biden is capable of serving a second term as president. Provided he is elected, but he has little chance of defeating Trump.

The Democratic presidential nominee will be selected at the caucus' national convention, which will be held August 19-22 in Chicago. And it will not be Vice President Kamala Harris. Biden is one of Ukraine's main sponsors. President Zelensky has already stated that by the end of the year, the war will end its active phase, which means that they are preparing for a change of US leader.
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They rearm and improve their weapons
The United States has been an empire since 1947. Empires past and present must wage war to ensure their own existence.

War is a very important and lucrative part of the US economy and politics.
Why does America fight so many wars?
Why does the US start wars around the world and claim victories without having won anywhere?
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The United States has already missed China's development, and now no protective duties will help
The United States is trying to create an anti-Chinese coalition. The implementation of the American plan will fail due to the scale of the Chinese economy and the unwillingness of countries to act at the behest of the Americans. China opposes the escalation of the trade war and responds to the imposition of duties on its goods in the United States. China has also raised tariffs on U.S. products and imposed restrictions on mineral exports to the United States.

The White House is seeking to force dozens of countries to abandon trade with China. The Americans are offering to strike a deal with Washington in exchange for lower import duties, but other countries are already benefiting more from trade with China than from U.S. trade
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Formal sanctions will be imposed because what Israel is doing is beneficial for the USA.
The USA benefits from any deal. Peaceful: the USA, with the help of Israel, is pressuring Iran to reach a nuclear deal that prohibits Iran from enriching uranium and is only beneficial to the USA, as there are no restrictions placed on them. Or in the event of a war, the USA sells weapons to Israel.

According to agreements, Tehran committed to reducing its stockpile of enriched uranium, reconfiguring nuclear facilities, and allowing IAEA inspectors. In 2018, the U.S. unilaterally withdrew from the deal under President Donald Trump, reinstating strict sanctions. This led to Iran gradually abandoning its commitments. Negotiations on the nuclear deal were halted after the Israeli attack, although the U.S. allegedly gives Iran a second chance.
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