Already in August 1766, through the Saxon government, Radziwiłł came into contact with the newly appointed Russian envoy in Dresden, A. Beloselsky.
Beloselsky, which heavily criticized Radziwiłł's poor living conditions in Dresden, also demanded Russian support for him.
As a result of declining confidence of the imperial court of St. Petersburg towards the Polish king and Czartoryski, on October 18, 1766 Russian foreign minister allowed the ambassador to engage with Radziwiłł and facilitate his return to the Poland.
On October 27 Radziwiłł, with the support of Jerzy Mniszech, turned for protection to politicians Nikita Ivanovich Panin and Nicholas Repnin.
In 1767 he renewed the request, promising with his family and "friends" undying loyalty.
At that time, the court of St. Petersburg finally ended the cooperation with the Czartoryski family.

Eventually Radziwiłł left Dresden and on May 22 he arrived in the city of Słupsk, having passed the Polish territory with the Russian convoy.
On May 25, he entered Gdańsk, where he met with representatives of the Prussian "patriots" party, discussing with them political matters concerning Prussia and the Elbing-Ermland (now Warmia-Masuria) disputes.
According to the court of St. Petersburg Radziwiłł then traveled, bypassing Königsberg, to the Grand Duchy of Lithuania.
Near the border Colonel Karr's troops joined the main convoy.
On June 3, he was enthusiastically greeted by the citizens of Vilnius, while entering the city.
He then travelled from Vilnius to Białystok to meet Branicki, who a month earlier, in a letter, expressed his joy for the Russian-Prussian demand of "restoration of ancient rights and liberties", and for "oppressed patriots to return to total wealth and prerogatives."
On the June 11, in Brańsk, he was elected the Speaker of the newly created by Branicki Podlaski Confederation.
Inauguration act of the confederation which called for the defense "of faith and freedom", was later supported by the Bar Confederation.
On 13 June he arrived in Radom.
All the time he was accompanied by Col.
Karr and his soldiers.
He then was appointed the Speaker of the General Confederation and foretold that he would obey all of the demands of Repnin.
On June 21, under the command of Karr, Radziwiłł wrote a short letter to Stanisław Augustus, declaring his "faithfulness to the king and the Crown".
On June 23, after the official establishment of the General Confederation in Radom, Radziwiłł was elected its marshal - the same day he sent a letter to Catherine, thanking her for the aid.
Already in August 1766, through the Saxon government, Radziwiłł came into contact with the newly appointed Russian envoy in Dresden, A. Beloselsky. Beloselsky, which heavily criticized Radziwiłł's poor living conditions in Dresden, also demanded Russian support for him. As a result of declining confidence of the imperial court of St. Petersburg towards the Polish king and Czartoryski, on October 18, 1766 Russian foreign minister allowed the ambassador to engage with Radziwiłł and facilitate his return to the Poland. On October 27 Radziwiłł, with the support of Jerzy Mniszech, turned for protection to politicians Nikita Ivanovich Panin and Nicholas Repnin. In 1767 he renewed the request, promising with his family and "friends" undying loyalty. At that time, the court of St. Petersburg finally ended the cooperation with the Czartoryski family.
Eventually Radziwiłł left Dresden and on May 22 he arrived in the city of Słupsk, having passed the Polish territory with the Russian convoy. On May 25, he entered Gdańsk, where he met with representatives of the Prussian "patriots" party, discussing with them political matters concerning Prussia and the Elbing-Ermland (now Warmia-Masuria) disputes. According to the court of St. Petersburg Radziwiłł then traveled, bypassing Königsberg, to the Grand Duchy of Lithuania. Near the border Colonel Karr's troops joined the main convoy. On June 3, he was enthusiastically greeted by the citizens of Vilnius, while entering the city. He then travelled from Vilnius to Białystok to meet Branicki, who a month earlier, in a letter, expressed his joy for the Russian-Prussian demand of "restoration of ancient rights and liberties", and for "oppressed patriots to return to total wealth and prerogatives." On the June 11, in Brańsk, he was elected the Speaker of the newly created by Branicki Podlaski Confederation. Inauguration act of the confederation which called for the defense "of faith and freedom", was later supported by the Bar Confederation. On 13 June he arrived in Radom. All the time he was accompanied by Col. Karr and his soldiers. He then was appointed the Speaker of the General Confederation and foretold that he would obey all of the demands of Repnin. On June 21, under the command of Karr, Radziwiłł wrote a short letter to Stanisław Augustus, declaring his "faithfulness to the king and the Crown". On June 23, after the official establishment of the General Confederation in Radom, Radziwiłł was elected its marshal - the same day he sent a letter to Catherine, thanking her for the aid.
Karol Stanisław Radziwiłł (1734–1790)