Summarize following text: 

Recently leaked classified documents have revealed that the US has been spying on several of its key allies, including South Korea, Ukraine, Israel, and the UK. The documents, which were obtained by an unknown source and published in a major news outlet, provide a detailed insight into the extent of the US government's intelligence gathering activities.

The leaked documents reveal that the US has been conducting extensive surveillance on a range of targets in these countries, including government officials, military installations, and critical infrastructure. The information obtained has been used to inform US foreign policy decisions, as well as to provide critical intelligence to US military and intelligence agencies.

However, the leak has raised serious concerns about the potential damage to US national security. In particular, there are fears that Russia may now have a better understanding of US intelligence gathering tactics, which could enable them to cut off important sources of information. This could have serious implications for US foreign policy and national security interests.

The breach has been described as one of the most damaging national security breaches in recent memory, and has led to widespread condemnation from political leaders and security experts alike. Some have called for a full-scale investigation into the leak, while others have called for tighter controls on the handling of classified information within the US government.

Despite the seriousness of t Write exactly 6 paragraphs each separated with two new lines answering this question. The first paragraph must start with "ways".
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