"I can just go?" Nelson says in disbelief. The video, posted in September, went viral and has since accumulated more than 1.1 million views and been shared more than 15,000 times. Nelson's TikTok post became part of a trend of teachers posting similar videos of themselves quitting their jobs, which spilled over into the news.

Putin is said to blame the agency for intelligence which assured him ahead of the invasion that Russian forces would face only token resistance from the Ukrainian army and that Ukrainians themselves were eager to be rid of their leaders.

Last week, Andrey Soldatov, a respected author on the Russian secret services, said sources inside the FSB told him that Sergey Beseda, 68, head of the agency's foreign service, had been placed under arrest on Putin's orders.

Goldhaber advocates for increasing pay at the beginning of teachers' careers, where retention rates are low, and for people with STEM training.

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