Russia has formally declared that Metrojet Flight 7K9268 was taken down by a bomb:

Russia the first time on Tuesday that a bomb aboard a Russian charter jet full of vacationers had destroyed the aircraft that crashed more than two weeks ago on Egypt’s Sinai Peninsula, and the Kremlin responded immediately by escalating airstrikes across Syria.

The Russians said they were coordinating their military campaign with France in sharply ratcheting up attacks on Syrian territory, especially areas held by the Islamic State, the militant group that has asserted responsibility for destroying the Russian jetliner and for the deadly attacks across Paris on Friday.

The timing of such a highly orchestrated announcement, after an outraged France had already started striking Islamic State targets and had called for a united front against the group, suggested that the Kremlin was using the moment to help rebuild frayed relations with the West.

The Kremlin also announced that President Vladimir V. Putin and his French counterpart, François Hollande, had spoken by telephone, had agreed to coordinate military attacks in Syria and will meet on Nov. 26 in Moscow.

It is not a surprise that they have made it official, and they do deserve props for waiting until they had some data, as opposed to, for example CNN, where they freak out over a mouse fart in DC.