The Soviet Union had just failed in Afghanistan
It only became clear it was a "failure", towards 87-88 and onwards. In 1981 the Soviet Union, could boast of achieving all its goals in Afghanistan. A masterful special operation, had neutralized the previous government with minimal bloodshed. Socialist government was installed across the country, and aid was pouring in.
The CIA and the Arabs only really "turned on" much later.
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Regarding Jaruzelski, in the book from which I was paraphrasing different parts of his biography, everything Kania said is confirmed from the Soviet side. The book is Russian, and to some extent benefits from Soviet archival resources which I am not sure the author of Kania's book had access to.
1981 was the last year before Brezhnev's death. According to the so called "Brezhnev Doctrine", the type of things happening in Poland were to be promptly suppressed. However, Andropov (yes, Lord Voldemort himself), Suslov, and Jaruzelski convinced Brezhnev that it was a terrible idea.
Without the voice of Jaruzelski, some sympathetic members of the Politburo, and his wild gambit whereby he took all the men out of the barracks, Solidarity would have been crushed.