The share Russian treasury bonds held by foreign investors reached an all-time high at the beginning of last month as central bank data showed.

Foreigners' share in rouble-denominated OFZ bonds climbed to 33.2 percent as of Oct. 1 from 31.6 percent on Sept. 1, the data showed.

Separately, central bank data showed that foreign investors increased their holdings of Russia sovereign Eurobonds to $14.562 billion as of Oct. 1, which accounts for 36.6 percent of all the Russian Eurobonds.

As of July 1, foreigners' share in Russian Eurobonds was at 31.7 percent.