He said 35 other countries are ready to join the boycott for “fair sport” but did not name them.
During the night, military vehicles were also on the road in the city centre with security tightened.
He led the Soviet Union from 1985 until it was dissolved in 1991 after he introduced several social and economic reforms that were more popular abroad than at home.
Russia allegedly promises volunteers monthly pay of 100,000 roubles ($1,625), bonuses, payments to their families in the event of death, and an amnesty.
A government report on Monday said the Russian leadership had agreed with Kyiv and Turkey on a scheme to release grain shipments from Odessa.
