The deputy chief of the Russian general staff, Lieutenant-General Vadim Shamarin, has been arrested on a charge of corruption, state media reported.
A military court sitting in Moscow on Thursday ordered that Shamarin, 52, be held in custody for two months while investigations proceed. Shamarin is alleged to have accepted bribes on an especially large scale, state news agency TASS reported.
Details of the investigation were not released. Shamarin, who heads the general staff's communications unit, is reported to have accepted bribes when concluding contracts.
The Russian military leadership has for weeks been hit by a series of corruption scandals and arrests.
The Kommersant daily newspaper reported that a search had been conducted before Shamarin's arrest. The general had then been taken before a hearing of the military department of the investigating commission and subsequently taken into custody.
His arrest follows those of former deputy defence minister Timur Ivanov and Yuri Kuznetsov, the head of the personnel department.
Allegations of extreme corruption are frequently made against the Russian military leadership. Yevgeny Prigozhin, head of the Wagner mercenary group, complained repeatedly and attributed setbacks on the front in Ukraine to top-level corruption.
Prigozhin, formerly a close ally of President Vladimir Putin and known as "Putin's chef," died in a plane crash in August last year, two months after he led a failed mutiny.
Prigozhin directed his criticisms primarily against Sergei Shoigu, who was removed by Putin from his post as defence minister earlier this month and appointed the new secretary of the Security Council.
Economics expert Andrei Belousov has been appointed the new minister of defence, taking charge of expenditure in the ministry. Valery Gerasimov is to continue in his post as chief of the general staff.