Borusewicz had been set to head Poland's delegation, but his address was ultimately read by Konrad Pawlik, deputy foreign minister.
''Through my presence at the funeral, I had wanted to show that Poles are not anti-Russian, they are not enemies of a democratic Russia,'' wrote Borusewicz.
''By paying tribute to the assassinated I had wanted to express great respect to all those Russians, the sons of the great Russian people who think like him,'' Borusewicz added.
People queue to pay their last respects to murdered Russian opposition leader Boris Nemtsov during a mourning ceremony at the Sakharov centre in Moscow. EPA/SERGEI ILNITSKY
Nemtsov, who served as deputy prime minister during Boris Yeltsin's presidency (1997-1998), had repeatedly accused President Putin of lying over whether Russian troops were fighting in Ukraine.
He had a long track record of branding Putin's regime as corrupt, before being gunned down in central Moscow on Friday night.
Borusewicz claimed that the Kremlin ''has led an aggressive war [in Ukraine], undermining the European order.''
He accused Russian authorities of conducting ''a chauvinistic campaign against people who do not agree with imperialistic policies and aggression against a neighbouring country.''
The senator claimed that Nemtsov ''fell victim to this policy'' and that those responsible ''should be held accountable.''
Borusewicz was a key figure in the Solidarity trade union and he spent four years in hiding after martial law was imposed by the communist regime in Poland in 1981. He became a senator in 2005.
Borusewicz was a key figure in the Solidarity trade union and spent four years in hiding after martial law was declared in Poland in 1981. He became a senator in 2005. - See more at: http://www.thenews.pl/1/10/Artykul/198805,Senate-Speaker-to-attend-funeral-of-slain-Russian-oppositionist#sthash.ALkNDQtL.dpuf
Borusewicz was a key figure in the Solidarity trade union and spent four years in hiding after martial law was declared in Poland in 1981. He became a senator in 2005. - See more at: http://www.thenews.pl/1/10/Artykul/198805,Senate-Speaker-to-attend-funeral-of-slain-Russian-oppositionist#sthash.ALkNDQtL.dpuf
Besides Borusewicz, Latvian MEP Sandra Kalniete was also denied entry to Russia to attend the funeral. Foreign officials present at the ceremony included US Ambassador to the Russian Federation, John F. Tefft. (nh)
Source: TVN